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 at homegarden.cahnr.uconn.edu, or reach out to your local UConn Extension Center at extension.uconn.edu/locations.