Oddities

Seeing Ghosts in Your Garden?

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By Emily Leahy, UConn Plant Diagnostic Lab

While meandering around my backyard this past weekend, I spotted a striking plant which I had never seen before. At first instinct, I assumed it was a particularly unique fungal species and snapped a couple pictures. My curiosity having been piqued, I did some research and learned that it was in fact not a fungus, but a parasitic plant reliant on fungus – Monotropa uniflora. Its name is self-descriptive; Monotropa, illustrating the single turn of its shepherd hook shape, and uniflora, depicting the lone flower produced on each stem. It is also known as “Ghost Plant” or “Indian Pipe.”

Pale white stem and leaf structures of Monotropa uniflora.
Monotropa uniflora in a shaded area. Photo by Emily Leahy, UConn Plant Diagnostic Lab

Perhaps the most unusual feature of Monotropa uniflora is its color, or lack thereof. While mostly white-colored overall, hues of pink can be visible along with black flecks spread along the plant. The translucent nature of the plant is derived from the absence of chlorophyll, a green pigment and key component allowing autotropic plants to perform photosynthesis.

Autotrophs are organisms that convert abiotic (non-living) sources of energy, like sunlight, into organic compounds they can use for food production. Most plants have this ability, using the chemical reactions in photosynthesis to produce carbohydrates for their own nourishment. However, Monotropa uniflora, a heterotrophic plant, cannot carry out such processes. They seek the organic compounds needed to sustain themselves from external sources. Autotrophs are often referred to as “producers” and heterotrophs “consumers” to illustrate this distinction. Since Monotropa uniflora is not directly dependent on sunlight for survival, it is often found in shaded areas and forests.

This all begs the question – where does Monotropa uniflora get its nourishment from? The answer comes in the form of its parasitization of mycorrhizal fungi and surrounding trees. The term “mycorrhizal” is used to describe fungi that form a symbiotic relationship with the roots of its host plant. The interaction is mutually beneficial – mycorrhizal fungi receive sugars and carbon from its host, which in turn is aided by the fungus in its absorption of water and nutrients. The root system of the host plant is used as a transportation highway in these interactions.

Monotropa uniflora inserts itself as a third player in the relationship, disrupting its balance. In a clever sleight of hand, the parasite tricks the mycorrhizal fungi into thinking it is forming another symbiotic relationship as its root system interacts with the fungal mycelium. However, the benefits of this interaction are strictly one-sided as Monotropa siphons the carbohydrates, initially derived from the mycorrhizae’s host trees, for its own consumption. This is not severely detrimental to the fungi or host plants, but it certainly detracts from the vigor of their symbiotic relationship and the amount of available resources transferred between the two entities.

Monotropa uniflora has a wide range of distribution throughout the U.S., so it is possible to see these fascinating plants in action in a variety of locations. Its flowering season ranges from early summer to early fall and it thrives even after seeds are released.

A microcosm of ecological phenomena, Monotropa uniflora is quite the unique find. It is enthralling not only to observe, but also to know the complex interactions that occur just below ground. I say we can overlook its parasitic tendencies and appreciate its role in the delicate balance of our natural world – after all, everyone loves a good villain, right?

Need help identifying something interesting in your garden? We’re here to help! 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 cahnr.uconn.edu/extension/locations.

This article was published in the Hartford Courant July 19, 2025

Firefly Petunias Light Up the Night

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By Dr. Matthew Lisy, UConn Adjunct Faculty

A pot of white flowered firefly petunias
Firefly Petunias by Day. (Photo by M. Lissy)

The world of genetics has really had a tremendous impact on our lives. There is a lot of talk about GMOs, or genetically modified organisms, in the news. Labels even alert us to the presence of these crops in our foods. I wanted to share a new plant called the Firefly Petunia. It was not fireflies, but mushrooms that gave this plant its ability to glow. This is known as bioluminescence in the world of biology.

Through feats of genetic engineering, a gene is taken from one organism and placed into another.  This is where people become worried. Humans, however, have been doing this for hundreds of years. The best looking or most productive organisms were bred together for the next generation.  This is called selective breeding, and it essentially concentrates beneficial versions of genes in the offspring.

Now what is determined to be the most beautiful is truly in the eye of the beholder. Some people, for example, selected for white flowers in a normally purple flowered species, Echinacea purpurea. Some have even taken things a step farther and crossed different species of plants to obtain new colors of flowers. In nature, separate species have evolved isolation mechanisms to maintain their identity. When our plant breeders force a cross of the species boundary, much of the time it was done with closely related species of plants within the same genus.  A great example of this is the crossing of Echinacea purpurea, the purple cone flower, with Echinacea paradoxa, the yellow cone flower. This was done to obtain hybrid offspring that have red or orange flowers. These were back crossed with the parent varieties, so they have the same growth habit and form, but with new colored flowers.

Firefly petunia flowers glowing green in the dark.
Firefly petunias by night. This is no trick, the plants actually glow (photo by M. Lisy)

This hybridizing never really ruffled many feathers though, as the plants were very closely related anyway. More modern GMOs, like our Firefly Petunias, are obtained not through “natural” pollination processes, but through genetic manipulation. Scientists literally take one or more genes from one species and place them in another. These species are not closely related, so it may become an ethical conundrum. Here, one may ask if we should take a gene from a mushroom and place it into a plant. A similar circumstance was seen over twenty years ago in the aquarium industry, where genes from corals and jellyfish were placed into tropical fish to make them fluorescent Glofish.

On the question of ethics, I cannot tell you what to think, or what is right or wrong. We each will need to answer that question for ourselves. It does remind me of a quote from Jurassic Park, where Dr. Ian Malcolm states “…your scientists were so preoccupied with whether or not they could that they didn’t stop to think if they should.” The real question is where do we go from here. For the fish, it was species after species of Glofish, and for me, the novelty started wearing off. After all, how many species will be made fluorescent before it just gets boring? Now for our plants, will we have roads lined with glowing trees to eliminate the need for streetlights? Will we have glowing houseplants that function like night lights? Ultimately, it will be up to you, the consumer.

For me, this is just cool science. We ship and plant petunias all over the world. Are these glowing petunias going to cause any harm? Probably not, as none of the other ones have. When I go outside at night to take the dog out and see the bioluminescent petunias, it puts a smile on my face. It reminds me of the fact that we, as humans, are capable of many things. I can’t help but ponder if this will inspire a sense of awe and wonderment in our children. Maybe some may even study genetics because of these petunias. What if one of them ends up finding a cure for a debilitating human disease, all because of a glowing plant? And while some may say that this daydream of mine is just science fiction, need I remind you that so were glowing plants a few years ago?

For your gardening questions, feel free to contact us, toll-free, at the UConn Home & Garden Education Center at (877) 486-6271, visit our website at www.ladybug.uconn.edu or contact your local Cooperative Extension center.