Author: Zidack, Heather

Putting Plants Outside, Lilacs, Butterflies & Other May News

Banner reading “May 2026” centered on a dark blue panel, flanked by white spring blossoms against a blue sky on the left and three flagpoles on the right displaying the U.S. flag, a POW/MIA flag, and a UConn flag

“The month of May is the gateway to summer"

— Jean Hersey

Moving Update

The George Leigh Minor Plant & Soil Health Center move has been delayed due to unforeseen circumstances.

The Home Garden Education Office will be closed for walk-in services starting April 27th. Our target reopening date in our new location is now  May 18th. 

For the comfort and safety of our clients, our office will be closed to the public until our re-opening. Please continue to use our phone and email support during this time. If you are planning to send samples to the Plant Diagnostic Lab or Home Garden Education Office, please call ahead for shipping instructions. Thank you for your understanding.

Closures may also impact the Soil Nutrient Analysis Lab and the UConn Plant Diagnostic Lab. Please check with them directly for more information regarding closures during the move.

Due to these shifts in schedule, our May 16th Open House Event has been postponed until Fall 2026.

To accomodate for our adjusted moving timeline and a busy gardening season, our partners in the Plant Diagnostic Lab, the Soil Nutrient Analysis Lab and the Department of Plant Science & Landscape Architecture have decided to wait until Fall 2026 to celebrate our grand opening. Keep an eye out for new dates!


 When Can I Put My Plants Outside?

Green watering can on a small table surrounded by trays of seedlings on a wooden deck.

Photo by Heather Zidack, UConn Home Garden Education Office

Houseplants

To give your houseplants a refresh and encourage healthy growth, begin acclimating them to outdoor conditions for the upcoming summer. On warm days, move your plants outside, while avoiding locations that endure direct exposure to sun or harsh winds. Once nighttime temperatures are consistently above 50-60°F, it is an appropriate time to begin keeping plants outside overnight.

For plants that prefer a sunnier environment, gradually expose them to locations in direct sun over a period of two weeks. If nighttime temperatures dip below 50°F, move plants inside for the night, being sure to check for insects beforehand. 

Moving Indoor Plants Outside for the Summer

Vegetables

Cool season vegetables including leafy greens, brassicas, and root vegetables may be able to go outside before your houseplants, but they need the same care in transitioning them from inside to out.

If you have warm season plants like peppers, tomatoes or eggplant, be sure to keep them warm just a little bit longer. Peppers, especially, like warm soil and warm air temperatures to grow well.

If your plants aren't ready but you're itching to do something, consider transplanting them into 4 inch pots them so that they can continue to grow comfortably while they wait to go outside.

Keep Your Seedlings Going Strong

Hanging Baskets & Annuals

Annuals are tender and most commonly do best in temperatures similar to our houseplants. When temperatures are consistently above 50-60°F at night, they should be safe to go outside permanently.

There are some exceptions to the rule, like Pansies, and other cool season flowers that may tolerate and even thrive in lower temperatures. We still recommend taking the precautions to harden them off, especially if they were purchased from an indoor setting. 

Selecting, Hardening, and Planting Bedding Plants

Perennials & Shrubs

In most cases, shrubs and perennials should be safe to go out as soon as you purchase them. Especially if they seem to have been stored outside at the nursery. If you're walking through a greenhouse to select your plant material, it may be an indicator that it isn't ready for low nighttime temps and may be especially sensitive to late spring frosts.

First year perennials started indoors or in greenhouses may need to be hardened off, the same way tender houseplants, vegetables and annuals are.  Ask your local nursery professional if you have questions about plant readiness.

Hardening Transplants


 Interesting Insects: Tiger Swallowtail Butterflies

Yellow tiger swallowtail butterfly with black stirpes resting among clusters of pale bluet flowers with yellow centers in a sunlit meadow.
Pamm Cooper, UConn Home Garden Education Office

Tiger swallowtail butterflies can be seen by late April when crabapples and native little bluets (Houstonia caerulea) are flowering. They visit both flowers for much needed nectar. Bluets often form large stands on lawns and woodland edges where there is a good amount of sun. Tiger swallowtails use small black cherry and tulip trees as caterpillar host plants. They breed as early as May.

Eastern Tiger Swallowtail


 Spring is For Lilacs

Bumblebees on fall blooming lilacs
Photo by Pamm Cooper, UConn Home Garden Education Office

To maintain the striking beauty of your lilacs for many years to come, practice regular pruning techniques. As a spring-blooming shrub, lilacs develop new buds for the next season following the current year’s flowering period is complete.
For this reason, prune immediately after bloom (often in May) to avoid removing next year’s flowers. Deadhead by pruning spent blooms promptly to promote strong flowering next year. Late spring is also the ideal time to practice renewal pruning. Cut back old growth (tall and overgrown stems) at the base, allowing light to reach previously shaded areas.

Over the course of a few seasons utilizing this technique, lilacs will appear fuller and vigorous with new shoots and flowers blooming on lower areas. Lilacs can be shaped according to your preferences by pruning during this time as well.


Native Plant Highlight: Tulip Tree

Yellow-green tulip tree flower with orange stamens opening among bright green, lobed leaves on a sunlit branch; a small “© Pamm Cooper” watermark appears in the lower right
Photo by Pamm Cooper, UConn Home Garden Education Office

The tulip tree Liriodendron tulipifera, commonly known as yellow poplar or tulip poplar, is a fast-growing, deciduous native of eastern North America that belongs to the Magnolia family.

It has attractive green, yellow, and orange flowers in May that resemble tulips. It is one of the largest North American native trees and sometimes reaches over 200 feet in height. Its leaves are distinctive, forming a broad, flat apex that ends at right angles to the midvein.

Learn More About Tulip Tree

The CT Native Plant Availability List: Updated and even MORE user-friendly!

This native plant guide was created to assist municipalities, conservation organizations, homeowners, landscape architects, designers, and contractors with locating native plants for habitat restoration and wildlife enhancement.

The Connecticut Native Plant Availability List, by UConn Extension and CT DEEP Wildlife Division, identifies nurseries and garden centers that grow/sell native trees, shrubs, and perennials. Along with several nurseries that are new to the list, we have also added the ability for users to view the Availability List sorted by Nursery!

CT Native Perennial, Tree & Shrub Availability List


Word from the WiSE

Women in Soil Ecology, UConn Student Chapter

Soil Mates: Finding Your Perfect Topsoil Match

From homeowners to landscapers, farmers to developers, many purchase topsoil for
their yearly plants and projects. Topsoil is the surface layer of soil, and can range in thickness from zero to twelve inches depending on how much the soil is worked. Deciding which topsoil you purchase can make or break your season, and inspection is important! Before committing to one topsoil, take a look at the soil stock pile and make sure there is no trash, large rocks, or debris. Soil texture, or the ratio of sand, silt, and clay in a soil, can greatly impact your topsoil. Some great soil textures for your topsoil include loamy sands, loams, silt loams, and sandy clay loams. Many other factors could influence the success of your topsoil, including organic matter and possible amendments. Purchasing a quality topsoil is vital to your soil health, so make sure you get the perfect match!

By Zaira O’Leary, Soil Science Master’s Student, UConn PSLA


Weather Outlook

A seasoned gardener always keeps their eye to the sky at any time of year! Maps and the 30 day outlook from NOAA will help you stay prepared for any and all of your gardening chores! (Click image to see larger map.)

Monthly Temperature Outlook Map of United States
Monthly Precipitation Outlook Map of United States

We Need Your Input!

The UConn Home and Garden Education Center is asking for your input to help guide future programs and services. Please take a few minutes to complete our needs assessment survey and share what topics, resources, and support would be most helpful to you.

Your feedback will help shape upcoming educational offerings and strengthen our ability to serve Connecticut gardeners.

Thank you for your feedback!

If you have any questions about this survey, please email us at ladybug@uconn.edu

Take the Survey!


Upcoming Events and Things to Do


            Join Us at Upcoming Talks

            Gardening for Butterflies with Pamm Cooper
            May 7, 2026 - 6:00 PM
            Plainville Library
            56 East Main St, Plainville, CT 06062Good Bug/Bad Bug/Benign Bug with Pamm Cooper
            May 11, 2026 - 1:00PM
            Hosted by the Redding Garden Club
            Redding Community Center
            37 Lonetown Rd, Redding CT 06896

            May Gardening Tips

                  • Remove spent blooms on tulips, daffodils and other spring flowering bulbs. The plant will focus its energy on growing new bulbs rather than producing seeds
                  • Plant dahlias, gladioli, cannas and other summer flowering bulbs
                  • Lift, divide and replant late summer and fall-blooming perennials such as asters, mums, and sedum
                  • Disinfect all pots and containers before refilling them for the season
                  • Check to see if your houseplants are root bound. Water them thoroughly and carefully remove them from their pots. If the roots have compacted around the outside of the root ball, it is time to repot.
                  • Have frost protection fabric or cloches, such as you can buy at garden stores, ready for unexpected late spring frosts
                  • Do not use a pre-emergent weed control if you are trying to germinate seeds in the same area.
                  • Check family members and pets for ticks after being outside, especially when in tall grass or wooded areas. If necessary send ticks to the Connecticut Veterinary Medical Diagnostic Laboratory for testing.
                  • Hummingbirds and orioles return to northern states by mid-May. Clean and refill feeders to attract these colorful birds to your backyard or fill hanging baskets with flowers that will attract them such as petunias, salvia, and fuchsia
                  • Disinfect bird baths with a 10 to 1 solution of water and bleach. Rinse well.
                  • Add water lilies to your pond when the water temperature reaches 70° F.


                  We're Moving in May 2026

                  New Location: 
                  George Leigh Minor Plant and Soil Health Center
                  University of Connecticut
                  Roy E. Jones Building Annex
                  27 Manter Road, Storrs, CT, 06269
                  (In front of UConn Dairy Bar)
                  Map of the Jones Annex across from the dairy bar

                  UConn Home Garden Education Office

                  Horticultural support and education for home garden issues related to plant health, garden pests, general plant care, and more.

                  UConn Plant Diagnostic Laboratory

                  Diagnosis of plant health and pest issues for commercial growers and the public.

                  UConn Soil Nutrient Analysis Laboratory

                  Soil chemistry testing including pH, nutrients, salinity, lime and fertilizer recommendations, and many others.

                  UConn Turf Diagnostic Lab

                  Turf diagnostics for golf courses, athletic fields, or other commercial turfgrass sites

                  What Stays the Same

                  We will continue to provide the professional and research-based support you’re used to, just in a convenient, central location. Our science-based testing protocols and result-driven recommendations reinforce our commitment to serving growers, landscapers, and the public with their plant and soil health issues.

                  What Gets Better

                  Combining current programs all under one roof provides an opportunity for more collaboration, outreach, and educational opportunities for our stakeholders.

                  • One easy-to-find location for soil, plant, and turf sample submissions
                  • Future expansion of diagnostic services available for plant and soil health analysis
                  • Collaboration between programs and increased opportunities for public outreach events
                  Watch for More Information Soon
                  s.uconn.edu/plant-soil

                  This Month’s Newsletter Contributors: 
                  Pamm Cooper, Lauren Kurtz, Emily Leahy, Zaira O'Leary, Heather Zidack

                  Keep Your Seedlings Going Strong! 

                  By Heather Zidack, UConn Home Garden Education Office 

                  So, you started your seeds, have been watching them attentively, and spring is knocking at the door. It’s still a little too early to put some things outside, but overzealous gardeners may find themselves swimming in seedlings that need management. Consider taking these steps to help you and your seedlings find a comfortable compromise as they wait to go outdoors. 

                  If you haven’t done so already, thinning your seedlings is an important step in ensuring that the plants you put in the ground will be robust and strong. As a fellow gardener, I’m familiar with the pain of disposing of “perfectly good seedlings.” However, this isn’t an entirely true belief. Seedlings that are not thriving in optimum conditions, may be indicating to you that they aren’t strong for planting in the garden.  

                  Thinning prevents crowding and allows for more air flow between seedlings. When crowded, seedlings compete for water, nutrition, light, and space. By thinning, we ensure that plants have enough resources to grow healthy. Thinning also helps to encourage airflow, which can reduce the risk of fungal development. Fungal pathogens can lead to issues like “damping off,” and other plant diseases that put your seedlings at risk.   

                  You may decide to thin your plants by snipping out weaker seedlings at the base. If you have the heart, the patience and the amount of valuable bench space to dedicate to extra seedling trays or containers, you may decide to carefully tease apart seedlings and replant them for one last chance. 

                  Green watering can on a small table surrounded by trays of seedlings on a wooden deck.
                  Photo by Heather Zidack, UConn Home Garden Education Office

                  Your strongest seedlings should be potted up into a larger container to encourage them to continue to grow. Putting seedlings into 3- or 4-inch pots (or recycled plastic cups with holes in the bottom) gives them a little bit extra wiggle room while we wait out these temperature fluctuations of a New England spring. Extra space for the root zone will allow the plants to continue to expand. More roots mean more water and nutrient uptake, leading to healthy growth. This practice may also help reduce watering needs on your part, since there is more media to hold moisture in the root zone.  

                  Are your tomato seedlings getting leggy? You can bury the stems of the tomato seedlings to help promote adventitious root development. Remove the cotyledons and any small leaves that you intend to bury below the soil line. Make sure to leave at least one third of the plant’s total height above the soil line to continue healthy growth. 

                  To this point, our seedlings have grown in optimum conditions, or as close to optimum as we’ve been able to provide. Not only have these conditions been ideal, they’ve also been consistent. When your plants get out to the garden, the new environment may be shocking. Hardening off is a process of transitioning them from their ideal growing conditions, into a more realistic environment. Any plant, whether it is a new seedling, a beloved houseplant, or a sheltered patio tropical, needs this transition when moving from inside to outside.  

                  Take your plants on “field trips” during warm spring days by placing them outside in a location with bright, indirect light. Full sun may be too strong for seedlings that have been acclimating with grow lights or through sunny windows so introduce direct light incrementally.  

                  Using cold frames can help to transition your plants from indoors to outdoors. These small, unheated enclosures use the sun’s energy to store heat like a greenhouse. This helps to reduce the drastic temperature swing of nightfall and insulate plants from frosts during the temperamental spring season. Crack them open during warm days for ventilation and to help start reducing humidity.  

                  When conditions are right for hardening off and planting your seedlings, continue to monitor weather conditions. Late spring in New England has been known to throw us a cold snap or two. If frost/freeze warnings occur, bring in potted plants and use a frost cover or breathable fabric to cover in-ground plants as frost protection. Garden stakes will help keep fabric from directly touching your plants and help create a warm air pocket around them to survive those incidental cold nights. 

                  Spring in New England is a season of transition. Warm days may signal planting time, but cool nights and shifting conditions remind us to move forward carefully. By thinning crowded seedlings, giving roots room to grow, and easing plants gradually into outdoor conditions, gardeners can help reduce stress and build resilience. A little patience and flexibility now can pay off with healthier transplants, stronger growth, and a more successful garden as the season continues to unfold. 

                  The UConn Home Garden Education Office supports UConn Extension’s mission by providing answers you can trust with research-based information and resources. For gardening questions, contact us toll-free at (877) 486-6271, visit our website athomegarden.cahnr.uconn.edu, or reach out to your local UConn Extension Center atextension.uconn.edu/locations.      

                  This article was published in the Hartford Courant April 26, 2026

                  Starting Raised Beds

                  By Dr. Lauren Kurtz, UConn Home Garden Education Office 

                  There are many styles of raised beds to choose from, depending on your needs. Raised beds exist on a spectrum, ranging from framed boxes above ground to unframed, elevated planting mounds. When planning new raised beds, both types have specific considerations to keep in mind. 

                  Mounded Raised Beds 

                  Mounded raised beds are created by mounding existing soil or adding additional material so the planting area sits above ground level. This method works well on compacted sites, in poorly drained areas, or on top of heavy clay soils. 

                  Most mounded raised beds do not have a barrier between the ground and the mound. However, if you are wish to start a raised bed over lawn, cardboard can be placed underneath the mounded soil to smother the grass. If you use cardboard, it is best to allow it to decompose for a few months before planting. This will allow plant roots to grow freely into the soil below rather than being blocked by the cardboard layer. 

                  The bed can be built using soil already on site, by mounding soil from the paths or edges into the bed. Alternatively, you can bring in topsoil and compost to create the beds. Any imported soil or compost should be free of pathogens, contaminants, and invasive weeds. Mounded raised beds are not tilled, and walking on the mound will compact the soil, so foot traffic should be avoided. These beds may need to be reshaped or re-mounded annually. Soil tests can be taken every two to three years, then apply amendments added as needed.  

                  Framed Raised Beds 

                  Two empty wooden raised garden beds placed on a grassy field, spaced apart and framed with light-colored lumber.
                  Framed raised beds. Photo by Lauren Kurtz, UConn Home Garden Education Office

                  Framed raised beds offer many of the same benefits as mounded beds, along with additional structure and accessibility. A framed raised bed is more contained than an in-ground bed and can be made of wood, metal, or pavers. These beds are well suited for compacted or poorly drained sites, locations with contaminated soil, or in gardens designed to improve accessibility for people with limited mobility. 

                  Raised bed depth can vary depending on the intended use. Some beds are only a few inches deep, while others may be up to 2 feet. Gardeners who use wheelchairs or who have difficulty bending may want to consider an elevated or deeper bed. Most annual vegetables require 12 to 18 inches of soil depth, root vegetables will require greater depth. Length and width can also vary based on site conditions, but a width of about an arm’s length is generally recommended for easy planting, harvesting, and weeding.  

                  Prefabricated wood or metal beds can be purchased, or you can build your own using lumber. Cedar is often preferred over pine because it lasts longer, although it is more expensive. Use caution when considering repurposed or pressure-treated wood. Before 2004, pressure-treated lumber was treated with copper, chromium, and arsenic, which could leach into the soil. If pressure-treated wood is used, make sure it is labeled for ground contact. Whenever possible, choose untreated or naturally rot-resistant materials. 

                  A good soil mix for framed raised beds is about one-half to two-thirds topsoil and one-third to one-half aged compost. This can require a large amount of material and may be costly depending on the size of the bed. Buying bulk topsoil by the cubic yard is usually less expensive than purchasing bags of raised bed mix. For smaller beds, bagged raised bed mix may be more practical. Avoid using free fill or topsoil from unfamiliar sources, as these may contain contaminants, invasive weeds, or invasive jumping worms. 

                  To save money on filling a raised bed, some gardeners use hügelkultur, a method that fills the lower portion of the bed with logs, sticks, leaves, grass clippings, or kitchen scraps before adding topsoil and compost on top. Larger materials are placed in the bottom then followed by smaller organic materials overtop. Over time, the bulky material breaks down and enriches the soil. Because the material settles as it decomposes, additional topsoil and compost may need to be added annually. 

                  Plant Choice 

                  Annual plants are generally better suited to raised beds than perennials or shrubs. Extreme temperature fluctuations in raised beds are not ideal for overwintering perennials, and the need to periodically add more soil makes raised beds better suited to annual crops. 

                  Care and Maintenance of Raised Beds 

                  Both mounded and framed raised beds dry out faster than in-ground gardens, so supplemental irrigation is usually needed throughout the growing season. Weed pressure may be minimal, but regular weeding will still be necessary. Raised beds should be mulched to help retain moisture and reduce weeds. 

                  The paths between raised beds can be planted in turf, covered with wood chips, topped with crushed gravel, or left as bare ground. Keep in mind that paths between mounded beds may need to be mowed or weeded regularly. They will also likely become compacted over time due to foot traffic. 

                   The UConn Home Garden Education Office supports UConn Extension’s mission by providing answers you can trust with research-based information and resources. For gardening questions, contact us toll-free at (877) 486-6271, visit our website athomegarden.cahnr.uconn.edu, or reach out to your local UConn Extension Center atextension.uconn.edu/locations.  

                  This article was published in the Hartford Courant April 14, 2026

                  Look Before You Leap Before Buying Fruit Trees

                  By Pamm Cooper, UConn Home Garden Education Office

                  Garden centers and other retail stores have fruit trees for sale now, and in some instances, the price is too good to pass up. But before you run out and buy fruit trees, there are some things you need to consider before purchasing. First and foremost, consider whether you will need more than one tree, or variety of tree, to ensure good cross-pollination.  

                  Peaches, tart cherry, and apricots are self-fruitful and do not need another variety in order to pollinate well. A single tree will produce fruit if all environmental conditions are adequate. But most sweet cherries and pears will not produce much fruit unless the proper cross-pollinator variety is nearby. For example, if you want Bartlett pears, then you will also need another pear variety- d’Anjou, Bosc, or Comice- to ensure proper pollination and good fruit yield.  

                  Providing a cross-pollinator with apples is especially tricky. They are self-unfruitful and require another variety of apple whose flowering period overlaps with it to ensure optimum pollination of the flowers. Pollinator requirements are often not well- understood by novice gardeners who are planning to grow apples for the first time. Many people make the mistake of only buying the apple trees they want for fruit, such as MacIntosh, and they do not realize they will need one more variety of the correct cross-pollinator to get fruit of an acceptable amount.  

                  Cluster of red apples growing closely together along a thick tree branch, surrounded by green leaves.
                  Photo by Pamm Cooper, UConn Home Garden Education Office

                  Apples belong to one of three groups- early, mid, and late-season -blooming. So early and mid-season blooming varieties will provide adequate cross-pollination and fruit set with each other, while mid and late-season varieties will do the same. A late blooming variety then will not provide cross-pollination with an early blooming variety. Conversely, an early blooming variety will not help a late- blooming variety cross-pollinate. The mid-season flowering varieties can be effective cross-pollinators of both the early and late-season varieties.  

                  Note: if there are flowering crabapples nearby that flower at the same time as the apple variety you have, then cross-pollination can be sufficient. Crabapple flowers attract diverse bees and other pollinators. If you already have an ornamental crabapple that flowers when your apple tree does, that will likely be sufficient to ensure good pollination of your apple tree. Apple varieties like Jonathan, Jonagold, Golden Delicious, Gal and several are listed a self-fruitful, but they will set more fruit if cross-pollinated.  

                  To simplify a gardener’s efforts to get the best cross-pollinators for their fruit trees, there are charts available that can be printed and brought to the garden center or nursery that will help in fruit tree selection. If you find a fruit tree variety you really like, do a little research before buying it see whether another variety will be needed for cross-pollination or not.  For a good fact sheet that explains the ins and outs of fruit tree pollination there is valuable information on the following link:  

                  https://extension.missouri.edu/publications/g6001 

                  I hope we have a great fruit growing year here in Connecticut. May the pollinators and good weather be with us. 

                  The UConn Home Garden Education Office supports UConn Extension’s mission by providing answers you can trust with research-based information and resources. For gardening questions, contact us toll-free at (877) 486-6271, visit our website athomegarden.cahnr.uconn.edu, or reach out to your local UConn Extension Center atextension.uconn.edu/locations.    

                  This article was published in the Hartford Courant April 12, 2026

                  Hold Off for Healthier Soil: Managing Spring Compaction Risks 

                  By Nora Doonan, Soil Science Graduate Student, UConn Department of Plant Science & Landscape Architecture 

                  Bare soil and patchy grass showing deep tire tracks and compacted earth across a lawn area.
                  Repeated traffic over lawn causing immediate, visible wear and long-term soil compaction. (Nora Doonan)

                  In the case of soil compaction, the early bird often does not get the worm. As temperatures rise, many Connecticut residents are eager to get back into their gardens and begin lawn care. However, after a winter marked by significant snowfall, the effects of snowmelt are still present in the form of pooling water and high soil moisture. Although the warmer weather may seem like the perfect time to begin spring yard work, it is often best to wait. Working or walking on wet soil can lead to compaction, a soil condition that can negatively impact plant health throughout the growing season. Wet soils are more easily compacted than dry soils, and once compacted, they are much harder to remediate.  

                  Soil compaction restricts root growth, making it difficult for plants to access water, nutrients, and oxygen. As a result, plants may show reduced growth and lower yields. Compacted soils also limit water infiltration, which can lead to increased runoff during spring precipitation events. This not only reduces water availability for plants but can also contribute to soil erosion and water pollution, particularly in areas located near streams, ponds, and other water bodies.  

                  Soil microorganisms are impacted by compaction, some of which are responsible for soil nutrient cycling. For example, compaction reduces pore space, which holds oxygen and a lack of oxygen in the soil can increase the rate in which some bacteria perform denitrification, a gaseous loss of nitrogen to the atmosphere. Other soil organisms are impacted as well. Non-burrowing animals, such as mites and springtails, have difficulty penetrating compacted soil, and there is often a decline in burrowing species like earthworms, ants, and beetles.  

                  Common causes of soil compaction include heavy foot traffic and the use of equipment such as lawn mowers, spreaders, and vehicles. Following the same consistent pathway through your yard and garden, even if it seems insignificant, can lead to substantial compaction overtime, especially in high soil moisture conditions. Homeowners should also be cautious about allowing heavy vehicles, such as mulch delivery trucks or off-street parking, onto lawns when soils are wet. Additionally, tilling wet soil can do more harm than good by creating dense soil layers and deep ruts. It is important to wait until soils have dried sufficiently before working them. 

                  To assess whether soil is compacted, start with a visual inspection. Areas with poor plant growth, shallow roots, or standing water after rainfall may indicate compaction. Simple field tests can provide further insight. One method is to dig into the soil with a shovel or spade a few days after a rainstorm. Signs of compaction include surface crusting, plate-like soil structure (resembling stacked dinner plates), or large, dense clods. Another method is to perform a soil hardness test. A few days after rain, try pushing a wire flag or similar probing object into the soil. Hold the flag at the top and press the wire into the soil without bending it. This test is most accurate when soils are moist but not saturated, and care should be taken to avoid rocks. If the probe penetrates less than 4 inches, the soil is considered compacted.  

                  Preventing soil compaction is far easier than correcting it. Avoid walking on garden beds and refrain from working soils when they are wet. Use lighter equipment whenever possible and maintain ground cover to protect the soil surface. If necessary, aerate compacted soils and incorporate compost or organic matter to encourage biological activity from soil organisms that naturally improve soil structure. While organic residues such as compost can help cushion the effects of compaction, excessive traffic will degrade these materials over time. Soils with low organic matter are especially vulnerable to compaction, making regular amendment essential. 

                  Patience in early spring can pay off throughout the growing season. Waiting until soils are drier before beginning yard work will help protect soil structure, promote healthy plant growth, and support long-term landscape sustainability. 

                  The UConn Home & Garden Education Center supports UConn Extension’s mission by providing answers you can trust with research-based information and resources. For gardening questions, contact us toll-free at (877) 486-6271, visit our website at homegarden.cahnr.uconn.edu, or reach out to your local UConn Extension center at extension.uconn.edu/locations

                  This article was published in the Hartford Courant April 4, 2026

                  Invasives, Insect Eggs, Starting your Garden & Other April Gardening News

                  Close-up of a pink flower bud beginning to bloom against a soft blue sky, with the words “April 2026” in decorative lettering on the left.*

                  “I love spring anywhere, but if I could choose, I would always greet it in a garden."

                  — Ruth Stout

                  Big Changes for the HGEO! We're Moving This Month!

                  The UConn Home Garden Education Office & some of it's collaborators will be moving into the George Leigh Minor Plant and Soil Health Center on the week of April 27th. During the move, we will be closed to the public with limited phone/email availability to allow for a smooth transition. Our office be closed April 27th through May 1st and will reopen May 4th to help with your gardening needs, just in time for the growing season!

                  Closures may also impact the Soil Nutrient Analysis Lab and the UConn Plant Diagnostic Lab. Please check with them directly for more information regarding office closures during the move.

                  Living room filled with stacked cardboard moving boxes and numerous potted houseplants, with a floor lamp and a tall stack of books along the wall.
                  Photo by Dina Badamshina on Unsplash

                  Save the Date: Saturday, May 16th 2026

                  To celebrate the grand opening of the George Leigh Minor Plant & Soil Health Center we will be hosting an Open House with our partners in the Plant Diagnostic Lab, the Soil Nutrient Analysis Lab and the Department of Plant Science & Landscape Architecture.

                  Join us for tours of the new facility, family friendly activities, educational demonstrations, and more! 


                   Catch Invasives in April

                  In April, many invasive plants are among the first to leaf out, making them easier to spot before other vegetation fills in.

                  Watch for green patches of lesser celandine carpeting moist lawns, stream banks, and woodland edges. The early leaves of  Japanese honeysuckle vines can be found climbing shrubs and fences. Invasive shrubs including Japanese barberry and  multiflora rose leaf out early and are seen on woodland edges and interior woods. This is an ideal time to scout your property, flag infestations, and plan management before these species flower and set seed later in the season. 

                  The First Signs of Spring: Spotting Invasive Plants

                  Bright green barberry shrub with small leaves growing among leaf litter in a leafless deciduous forest, with tall bare trees and blue sky in early spring

                  Bayberry in April. Photo by L. Kurtz, UConn Home Garden Education Office


                   Interesting Insects: Scout for Egg Masses

                  Early spring is a great time to scout for pest eggs before the weather warms up enough for them to hatch. Finding and destroying egg masses before they hatch is a very effective method of pest control in your garden, landscape, and lawn. Three major pest eggs to look out for at this time of year are the eastern tent caterpillar, spongy moth, and spotted lanternfly.  

                  Eastern tent caterpillars are best known for the webs they build in the forks of tree branches in spring and early summer. Their egg masses hatch right as trees leaf out, so make sure to look for them before tree buds begin to open! These one-inch-wide egg masses are commonly found wrapped around small twigs on cherry, crabapple, and apple trees. Prune or peel them off and destroy.

                  Close-up of a twig with green oval leaves and a dark, elongated gall or insect casing attached to the branch.
                  Brian Kunkel, Bugwood.org

                  The Spongy Moth is an invasive species that defoliates hardwoods in New England. Eggs were laid in the summer and have overwintered on tree trunks, branches, stumps, and sometimes stone walls or buildings. The egg masses appear tan and velvety. The eggs hatch in May, so it’s important to scout them out and destroy them now. They can be scraped or brushed off into a bucket of soapy water or squished into the ground.

                  Close-up of rough gray tree bark marked with scattered pale, oval patches clustered along the crevices.
                  Leslie J. Mehrhoff, University of Connecticut, Bugwood.org

                  Finally, be on the lookout for Spotted Lanternfly egg masses. This insect is invasive and destructive to grapevines, hops, stone fruit trees, and hardwood trees. It lays its eggs on any hard surface, such as trees, stones, fences, firewood, or vehicles. Egg masses will appear as columns of brownish seed-like deposits, about an inch long. When you locate egg masses, first smash them, and then scrape them off the surface into a plastic zip bag filled with hand sanitizer or rubbing alcohol. Then, zip the bag shut and throw it away. Finally, report the location of egg masses to the CT Agricultural Experiment Station. 

                  Close-up of a tree trunk with rough, dark bark, showing a coin held against the trunk for size comparison in a dry, grassy woodland setting
                  Sara Lalk, Clemson University, Bugwood.org

                   When Do I Get to Start Gardening?

                  When we have a few days of warm, sunny weather, gardeners get excited to get out and get to work!

                  Experienced gardeners tend to observe patterns and find natural milestones of when to start doing certain tasks. As an example, when the forsythia bloom, we often simultaneously see more activity in the garden and in the soil. This can act as a cue for certain management strategies in the garden.

                  If you dive into the phenology of our plants and insects, you will find that temperature consistency in various environments or conditions (soil, and air during the day or at night) fall pretty close in step with these observations, adding some scientific support to these methods.

                  However, New England Springs can throw us a curveball from time to time, and unpredictable conditions can throw our schedules significantly. Not too long ago, a late spring frost damaged many plants already in the ground!  

                  To take it a step further, looking at Growing Degree Days can help you determine when specific species of plants or insects may be emerging. Use this indicator to help you identify when to implement preventative measures for tricky garden pests or to help you determine if it's time to clean out your winter pollinator habitat with greater confidence. 

                  For a strong garden strategy, use a combination of tools including growing degree day calculators, soil temperature monitors, and your own observations of phenology to help you determine when the best time for any activity garden is for your specific location.


                  Native Plant Highlight: Sweet Fern

                  Close-up of sweet fern twigs with emerging curled leaves and fuzzy brown catkins, set against a woodland background of dry grasses and leafless trees under a blue sky.
                  Sweet Fern starting to leaf out in March. Pamm Cooper, UConn Home Garden Education Office

                  Sweet fern, Comptonia peregrinais a native shrub commonly found in acidic, dry, sandy soils. It is usually found in full sun but also can tolerate partial shade.

                  Look for it on slopes, roadsides, and disturbed sites such as power line rights-of-ways. Its fernlike leaves are aromatic when crushed. It flowers as early as March as it begins to leaf out. It is superb as a soil stabilizer on sandy slopes and where sandy soils support little else. It can form colonies over time via strong rhizomes.

                  Learn More About Sweet Fern

                  The CT Native Plant Availability List: Updated and even MORE user-friendly!

                  This native plant guide was created to assist municipalities, conservation organizations, homeowners, landscape architects, designers, and contractors with locating native plants for habitat restoration and wildlife enhancement.

                  The Connecticut Native Plant Availability List, by UConn Extension and CT DEEP Wildlife Division, identifies nurseries and garden centers that grow/sell native trees, shrubs, and perennials. Along with several nurseries that are new to the list, we have also added the ability for users to view the Availability List sorted by Nursery! 

                  CT Native Perennial, Tree & Shrub Availability List


                  Word from the WiSE

                  Women in Soil Ecology, UConn Student Chapter

                  Wait Now, Thrive Later: Soil Compaction 

                  This month, we’re bringing you a word on preventing soil compaction with spring patience. As temperatures rise heading into April, it’s exciting to start thinking about spring garden preparations. After a long winter and snowmelt, our soils are holding plenty of moisture, so giving them a little extra time can make a big difference. Working in soil that’s too wet, whether it be by walking on it or using equipment, can lead to soil compaction, sometimes referred to as the “silent thief” of plant growth. Compacted soil reduces the space roots need to grow, making it harder for plants to access water and nutrients.

                  The good news? It’s easy to check if your soil is ready. Just grab a handful of your soil and squeeze it and if it crumbles apart, you’re good to go! If it sticks together in a clump, it’s best to wait a little longer. A bit of patience now helps to create healthier soil, stronger roots, and a more successful garden all season long. Your plants will thank you! 

                  By Josenia Lopez, Plant Science Undergraduate Student


                  Weather Outlook

                  A seasoned gardener always keeps their eye to the sky at any time of year! Maps and the 30 day outlook from NOAA will help you stay prepared for any and all of your gardening chores! (Click image to see larger map.)

                  Monthly Temperature Outlook Map of United States
                  Monthly Precipitation Outlook Map of United States

                  Upcoming Events and Things to Do

                        • Celebrate Earth Day (Apr. 22) & Arbor Day (Apr. 24) with celebrations around the state!
                        • George Leigh Minor Plant & Soil Health Center Open House - May 16th, Storrs CT

                        Join Us at Upcoming Talks

                        Slime Molds & Lichens with Pamm Cooper
                        April 13, 2026 - 1:00 PM
                        Hosted by the Avon Garden Club
                        The Church of St. Ann, 289 Arch Rd., Avon, CT  

                        April Gardening Tips

                            • Pull back mulch from perennials to allow the soil to warm up but be prepared to temporarily cover them if heavy frosts are predicted.
                            • Freezing temperatures don’t harm pansies, but if they have been grown in a greenhouse they should be gradually exposed to outdoor temperatures before planting. Flowers can be damaged in frosts, but plants will survive.
                            • Weather permitting, direct sow​ ​peas, ​carrots, ​radishes, ​lettuces, ​and​ ​spinach every two weeks through mid-May for staggered harvests.
                            • Don't wait too long to remove mulches from strawberries. Once the leaves have emerged from under the straw and yellowing is evident, pull the mulch away from the tops of the plants and tramp it down between the rows. Keeping the base of the plants mulched helps keep the berries clean, controls weeds, and conserves moisture.
                            • Check​ ​fruit​ ​trees​ ​for​ Eastern ​tent​ ​caterpillars, ​they​ ​emerge​ ​around​ ​the​ ​same​ ​time​ as ​leaves​ ​sprout.​ ​Blast​ ​nests​ ​with a​ ​strong​ ​spray​ ​of​ ​water​ ​to​ ​destroy​ ​them.
                            • Apply pre-emergent crabgrass weed control when soil temperatures reach 50°F. Use a tool like this soil temperature map to track your timing. 
                            • Do not use a pre-emergent weed control if you are trying to germinate seeds in the same area.
                            • Complete​ ​removal​ ​of​ ​diseased, ​weak, ​or​ ​crossing​ ​branches​ ​on​ ​shrubs​ ​and​ ​small​ ​trees.
                            • Place peony supports.
                            • Start cleaning containers and pots so they are ready for planting.
                            • Divide overcrowded summer or fall blooming perennials.


                            We're Moving in April 2026

                            New Location: 
                            George Leigh Minor Plant and Soil Health Center
                            University of Connecticut
                            Roy E. Jones Building Annex
                            27 Manter Road, Storrs, CT, 06269
                            (In front of UConn Dairy Bar)
                            Map of the Jones Annex across from the dairy bar

                            UConn Home Garden Education Office

                            Horticultural support and education for home garden issues related to plant health, garden pests, general plant care, and more.

                            UConn Plant Diagnostic Laboratory

                            Diagnosis of plant health and pest issues for commercial growers and the public.

                            UConn Soil Nutrient Analysis Laboratory

                            Soil chemistry testing including pH, nutrients, salinity, lime and fertilizer recommendations, and many others.

                            UConn Turf Diagnostic Lab

                            Turf diagnostics for golf courses, athletic fields, or other commercial turfgrass sites

                            What Stays the Same

                            We will continue to provide the professional and research-based support you’re used to, just in a convenient, central location. Our science-based testing protocols and result-driven recommendations reinforce our commitment to serving growers, landscapers, and the public with their plant and soil health issues.

                            What Gets Better

                            Combining current programs all under one roof provides an opportunity for more collaboration, outreach, and educational opportunities for our stakeholders.

                            • One easy-to-find location for soil, plant, and turf sample submissions
                            • Future expansion of diagnostic services available for plant and soil health analysis
                            • Collaboration between programs and increased opportunities for public outreach events
                            Watch for More Information Soon
                            s.uconn.edu/plant-soil

                            This Month’s Newsletter Contributors: 
                            Heather Zidack, Pamm Cooper, Lauren Kurtz, Holly McNamara, Josenia Lopez

                            I “Heart” Philodendrons

                            By Dr. Matthew Lisy, UConn Adjunct Faculty

                             

                            Hanging philodendron plant with trailing green heart-shaped leaves in a black pot suspended by cords against a light-colored wall.
                            Philodendron hederaceum, the legendary Heartleaf Philodendron in its classic green form (photo by M. Lisy). 

                            Back in the late1970s when I stumbled upon my mother’s abandoned houseplant book, I had no idea what impact that would have on my life.  It was a treasure-trove of knowledge for me, and came with a gallery of some of the most common houseplants.  One in particular caught my eye – the Heartleaf Philodendron.  I was immediately in love (see what I did there?).  All jokes aside, this was one of the biggest staples of the houseplant world, and it still is.  Characterized by green heart-shaped leaves, they were commonly displayed in macramé plant hangers.   

                             These plants, like many of our houseplants, come from humid tropical Central and South American forests.  The word Philodendron comes from the Greek and means “tree lover.”  This name serves as both the scientific and the common name.  As one would expect, plants in this genus grow on trees in some fashion.  Of course there are exceptions, but most will readily grow up moss poles if provided.  A number of the species are perfectly suited to life in a hanging basket, and are commonly referred to as “trailing” to describe their growth habit.  A few of my favorite trailing-types are the ones I will focus on for this article.  Trailing Philodendrons are one of the easiest plants to grow and also the easiest plants to kill.  The secret to their success is to not over water them.  The top inch or two of the soil should dry out before they are watered again.  They are very unforgiving to overwatering, and quickly develop a fungal infection that will fist cause many leaves to drop, and then the vines will wither and die.  Many people see this and assume the plant needs more water, and then accidentally ensure the plant’s death.  If they are put outside for the summer, I recommend hanging them under a covered porch so the watering is controlled.  

                            The old-school Heartleaf Philodendron was just the beginning.  It is known as Philodendron hederaceum by scientists.  It may be incorrectly labeled as Philodendron cordatum, but this is an older/inaccurate name and beyond the scope of this article.  One modern favorite variety is called Lemon Lime.  As expected, it has some light green to yellow leaves in bright light.  Next to the regular green, this variety really stands out.  Lemon Lime is similar to one I had thirty years ago called Lemon which had only yellow leaves.  There is another new one called Neon that has all yellow leaves as well.  It is hard to know if these are true varieties or repackaged versions of the old Lemon with newer names.  Brazil is another very hardy variety that has green leaves with a large, thick yellow stripe down the center of each leaf.  There is variability in the amount of yellow in each leaf, which adds further interest to the plant.  A similar but more striking variety is called Silver Stripe.  This plant has a thinner stripe down the middle that is mostly cream or silver colored.  This was extremely expensive last year, but is much more common and therefore cheaper now.   

                             There are a number of different species with similar appearance and growth habits to our P. hederaceum.  One of the real stand-outs is the Philodendron brandtianum, commonly referred to as the Silver Leaf Philodendron or Philodendron Brandi.  The leaves are a gorgeous true silver color with green stripes following the veins.  These are slower growing than the others mentioned here.  By the end of last year, it was somewhat affordable in four-inch pots.  I have yet to see it offered in a larger hanging basket (probably a few years away from that).  A close look-a-like to this plant is the Philodendron sodiroi, which is also called the Silver Leaf Philodendron.  Though less intensely silver and with paler green coloration, the leaves are larger.  I finally saw one for sale last summer but passed on it as I think it was a mislabeled P. brandtianum.  Nevertheless, I am sure these will be equally popular with collectors. 

                            Close-up of a single bright green, heart-shaped leaf with smooth edges and subtle veins against a white background.Close-up of a heart-shaped leaf with dark green coloration and irregular lighter green variegation, slightly curled and textured, against a pale background. Close-up of a single heart-shaped green leaf with a lighter yellow-green stripe running down the center against a white background.
Close-up of a single heart-shaped leaf with dark green coloring and silvery mottled patterns against a white background.

                            From left to right: Philodendron hederaceum ‘Lemon Lime,’ ‘Brazil,’ ‘Silver Stripe,’ and Philodendron brandtianum (photos by M. Lisy). 

                            All of these plants are easy to propagate by cutting the stem and leaving one leaf per node.  Dip it in rooting hormone and keep it in a moist, clear-bag-covered pot and in a few months, there will be new growth.  Alternatively, they can be rooting in water, but I prefer the soil method as it doesn’t have to adapt from water to soil when transplanted. 

                             I am hopeful that this article will rekindle an old flame with the Heartleaf Philodendron or its relatives.  They are all generally available now in many of the big box, online, and brick-and-mortar plant stores.  Why not pick one up to beautify the home for many years to come? 

                            The UConn Home Garden Education Office supports UConn Extension’s mission by providing answers you can trust with research-based information and resources. For gardening questions, contact us toll-free at (877) 486-6271, visit our website at homegarden.cahnr.uconn.edu, or reach out to your local UConn Extension Center at extension.uconn.edu/locations.     

                            This article was published in the Hartford Courant March 28, 2026

                            The Carbon Sink Under Your Feet: Why Your Lawn Matters

                            By Dr. Avishesh Neupane, UConn Soil Nutrient Analysis Lab

                            A close up of a field of green grass
                            Photo by Maria Kovalets on Unsplash

                            When we think of climate solutions in Connecticut, our minds usually go to big things such as offshore wind, public transit, and forests. We rarely think about our lawns. But soil science suggests that the roughly 40 to 50 million acres of lawn and managed turfgrass in the United States represent a large and often-overlooked opportunity to help keep carbon dioxide out of the atmosphere, especially when those landscapes are well managed. Although forests store far more carbon overall in wood and soil, lawns can still play a supporting role by storing carbon mostly belowground, as long as maintenance inputs like fertilizer, mowing fuel, and irrigation are kept in check. In other words, done well lawns can store carbon in soil; done poorly, those same inputs can wipe out the gains and even make a lawn a net source of emissions. 

                            Your lawn and garden are not just aesthetic choices. They are living systems. Through photosynthesis, grass and other plants pull carbon dioxide from the atmosphere and turn it into sugars. Those sugars are basically “carbon packages” the plant uses to grow. Some of that carbon ends up in leaves, stems, and flowers, and some is sent belowground to build roots and feed soil microorganisms. 

                            As roots and microorganisms grow, die back, and regrow, they add carbon-rich material to the soil. That material becomes part of the soil’s organic matter. In the Northeast, well-managed turfgrass can store carbon at meaningful rates, with published estimates often ranging from a few hundred to more than a thousand pounds of carbon per acre per year. 

                            That same organic matter also gives soil what many gardeners call the “sponge” effect. It helps the ground absorb water, hold moisture longer, and maintain better structure. That means less runoff during storms, better drought tolerance during dry periods, and a healthier root zone overall. Healthier, carbon-rich soil helps a lawn do more than stay green. It helps the landscape better withstand weather stress and keeps more water and nutrients where they belong. 

                            Management that Protects Soil Health 

                            The benefits of a lawn or garden depend heavily on how it is managed. Poor soil management can weaken plant growth, reduce biological activity, and limit the soil’s ability to store carbon over time. If we want the lawn to store more carbon and withstand weather extremes better, management matters. We can start with the following practical steps. 

                            First, test your soil and apply only what the test calls for. Guesswork often leads to over-application of fertilizer, especially phosphorus and nitrogen. Excess phosphorus wastes money, can upset nutrient balance, and increases the risk of runoff into local waterways, where it can contribute to algae overgrowth. Excess nitrogen is also a concern because it can be lost to the air as greenhouse gases and to water through leaching and runoff, affecting groundwater and streams. A soil test helps you target nutrients and lime where they are actually needed, supporting healthier roots and the soil biology that helps build carbon-rich soil over time. 

                            Second, address compaction. When soil is compressed by repeated foot traffic or heavy equipment, it loses pore space. That limits air movement, reduces water infiltration, restricts root growth, and weakens biological activity. Carbon storage does not stop altogether, but the soil becomes less effective at building and holding additional organic matter. In lawns, core aeration can help relieve compaction. 

                            Third, keep the soil covered. Dense grass cover and recycled clippings help shield the soil, reduce erosion, buffer moisture swings, and support soil life. This also supports soil carbon by keeping roots growing and by reducing the loss of carbon-rich soil through erosion and rapid drying. The key is to maintain healthy turf and avoid practices that leave bare ground for long periods. 

                            A Landscape of Stewardship 

                            For Connecticut lawns, the real test is not just how green they look in a good week. It is how well they hold up through heavy rain, summer dry spells, and changing weather patterns. That resilience starts in the soil. 

                            A healthy, carbon-rich soil is one of the best ways to make a lawn more resilient. By focusing on plant-appropriate pH, good soil structure, and science-based nutrient management, we do more than improve how a landscape looks. We make it better able to absorb water, support plant growth, and store more carbon over time. 

                            Your lawn will not solve climate change on its own. But better soil management can make it healthier, more resilient, and modestly better at storing carbon. That is a practical win for landowners, for water quality, and for the broader environment. 

                            The UConn Home Garden Education Office supports UConn Extension’s mission by providing answers you can trust with research-based information and resources. For gardening questions, contact us toll-free at (877) 486-6271, visit our website athomegarden.cahnr.uconn.edu, or reach out to your local UConn Extension Center atextension.uconn.edu/locations.   

                             

                            This article was published in the Hartford Courant March 21, 2026

                            Watch for these Temperatures this Spring

                            By Heather Zidack, UConn Home Garden Education Office 

                            Emerging daffodil shoots growing at the base of a stone wall amid fallen leaves.
                            Photo by H. Zidack, UConn Home Garden Education Office

                            With a taste of spring earlier in the week, gardeners are itching to get back out there for a little bit of sunshine and horticultural therapy. Don’t let the forecast fool you, we still have a stretch of time before we can really do many of the gardening activities we love.  

                            Interestingly, there is a magic number for gardeners to watch out for. 50°F is a significant temperature for when we, as gardeners, can start to act. However, this temperature, in various applications, needs to be monitored to ensure we’re doing the right activities at the right time.  

                            The first thing we will look for in the spring is air temperature above 50°F during the day. Unfortunately, the couple of days we had last week weren’t enough to really set off the start whistles for us. Consistency is key. When we hit this consistent daytime temperature, we start to see more obvious signs of seasonal changes. With a sustained air temperature above 50°F during the day, we can start to do things like clean out our gardens. Many species of pollinators and beneficial insects will start to become active at these temperatures. While a more accurate tool, known as Growing Degree Days (GDD) can help you identify the specific needs of specific species of both plant and insect development, this rule of thumb gives us a guideline to start with. Remove thick, dense piles of wet and matted leaves, or consider gently fluffing them up with a rake. A one-to-two-inch layer can benefit our plants as a natural mulch, but dense piles should be relocated to compost or the edge of the wood line. If you encourage pollinator habitat, avoid shredding or mulching leaf material as an extra protective measure for any stragglers that may be slow to wake up.  

                            Soil warms much slower than the ambient air temperature, so while it may feel comfortable to work outside, the soil may not be primed for activity. We commonly encourage gardeners to monitor for a soil temperature consistently above 50°F as another milestone.  This guideline is found to be the baseline for germination rates of many warm-season plants, and sustained temperatures above this threshold are necessary to promote growth. Cool season annuals and perennials will have different soil temperature thresholds for germination and success. In addition, this is an ideal temperature range for many garden products like fertilizers and pre-emergent herbicides to be effective. As always, check the product label for specifics on temperature ranges, as different products and different species of plants all have different needs. While we get a daily forecast almost anywhere for air temperatures, soil can be a bit more challenging to track. Use tools like Cornell’s Fore Cast or similar resources to help track local soil temperatures.  

                            The last big milestone in the spring comes when nighttime air temperatures consistently reach 50°F or higher. At this point many of our houseplants and tender annuals, including  warm-season vegetables, can be planted in the garden or put out onto the patio without protection. This is the stage where we truly feel like spring has arrived and our gardening is in full swing.  

                             When we have a typical season, these benchmarks tend to happen in order. Days get warmer, soil follows suit, and nighttime temperatures are the last to stabilize. However, occasionally, the seasons can throw us a curveball and these may not sync up exactly as planned. Always monitor them as separate markers for the best outcomes in your garden.  

                            By watching these temperature thresholds as the season unfolds, we give our gardens the best possible start. These guidelines are a great place to start for the beginning gardener, and tools like the soil temperature map and growing degree days are there to help the advanced gardener fine tune their practice. Whatever your skill level, we’re here to help you grow!  

                            The UConn Home Garden Education Office supports UConn Extension’s mission by providing answers you can trust with research-based information and resources. For gardening questions, contact us toll-free at (877) 486-6271, visit our website athomegarden.cahnr.uconn.edu, or reach out to your local UConn Extension Center atextension.uconn.edu/locations.  

                            This article was published in the Hartford Courant March 14, 2026

                            Seed Starting, Simplified

                            By Holly McNamara, UConn Home Garden Education Office 

                            Seed-starting trays with tiny green seedlings emerging in soil
                            Photo by H. Zidack, UConn Home Garden Education Office

                            Growing plants from seed is one of the most rewarding parts of gardening. In Connecticut, late winter is the time to start many cold-weather crops indoors, so they’re strong and ready to move outside after the last frost. Starting seeds requires a fair amount of attention, but you don’t need any special tools – this is an affordable project that anyone can tackle.  

                            Start by choosing seeds from a New England or Connecticut–based company. Local seed companies offer varieties adapted to our shorter growing season and changing spring temperatures. One seed packet is usually enough for a 10- to 30-foot row.  To determine when to start your seeds, use a calendar and the most up-to-date forecast for the last frost. Write the sowing date on each seed packet, then group packets with similar planting times together to stay organized.  

                            You don’t need any fancy equipment to sow your seeds. All you need are containers with drainage holes and catch trays for excess water. Reuse items from around the house – Styrofoam cups, yogurt or cottage cheese containers, salad tubs, plastic takeout boxes, egg cartons – the list goes on! Before planting, wash containers with soap and water, then rinse with a solution of one part bleach to ten parts water to prevent disease.  

                            Choose a commercial seed-starting mix that is loose and drains well. Garden soil is not recommended because it is not sterile and can introduce mold or disease. Fill containers to about one inch from the top with a moistened seed-starting mix. Level and gently firm the surface. If planting more than one type of seed in a container, make shallow rows and sow seeds evenly. If planting just one type, you can scatter them lightly across the surface. Make sure to label them immediately before or after sowing. Then, cover your seeds with a thin layer of vermiculite or seed-starting mix. Very tiny seeds should remain uncovered. Mist gently with water or set the container in a pan of warm water to moisten from below. Cover the container loosely with plastic wrap or a plastic bag to hold in moisture. You likely won’t need to water again until seeds germinate. Place trays in a warm spot out of direct sunlight. Once seedlings emerge, remove the plastic and move them to a bright window with indirect light. Allow the soil to dry slightly between waterings, but don’t let the seedlings wilt. If needed, thin them out by snipping extras at the soil line with scissors. If they outgrow their containers, you can transplant them into individual pots once they develop one set of true leaves.  

                            Seedlings must adjust gradually to outdoor conditions, a process called “hardening off.” Start by placing them outside in part shade, protected from wind, for about a week. Bring them in at night before temperatures drop. During the second week, slowly increase sun exposure. Start by leaving them outside in direct sunlight for an hour for the first day, and then increasing the amount of time each consecutive day. After this week, if no freezing temperatures are expected, plants can remain outside until transplanting. Hardening off is important in the seed sowing process: skipping this step can lead to sunburned, damaged leaves.  

                            Choose a cloudy day to transplant your seedlings to reduce shock. Dig a hole twice as wide as the plant’s root ball. Gently remove the plant from its container with a spoon, keeping as much soil around the roots as possible. Try not to grasp the plant by its stem; this can cause serious damage. Set it in the hole at the same depth it was growing in its container. Fill the hole gently, without packing the soil tightly around the roots.  

                            Annual flowers like marigolds and zinnias are excellent for beginners. Check the seed packet to determine how many weeks are needed before transplanting outdoors. In late winter, gardeners can start artichokes, perennial herbs, chard, salad greens, onions, leeks and more. By late February/early March, sow cole crops such as broccoli, cabbage, cauliflower, Brussels sprouts, and kale. Tomatoes and peppers can also be started indoors for transplanting later in spring. In New England, peas can be planted outdoors as soon as the soil is workable.  

                            Starting seeds indoors may seem technical at first, but it’s simply a matter of timing, clean containers, good grow mix, and patience. With a little planning now, your garden will be off to a strong start when warm weather finally arrives.  

                            The UConn Home Garden Education Office supports UConn Extension’s mission by providing answers you can trust with research-based information and resources. For gardening questions, contact us toll-free at (877) 486-6271, visit our website at homegarden.cahnr.uconn.edu, or reach out to your local UConn Extension Center at extension.uconn.edu/locations. 

                            This article was published in the Hartford Courant March 7, 2026