White Mushrooms Growing in Potted Plants

One of the few plants that reproduce with spores rather than seeds, mushrooms often seem to pop up without warning. Although it can be surprising when a mushroom appears in a potted plant, its appearance is usually no cause for alarm.

Identification

The mushroom most likely to spring up in potted plants is commonly known as the flowerpot parasol (Lepiota lutea). This species of mushroom starts out a yellow color that fades to white or pale yellow. Lepiota lutea is 1 to 3 inches tall with a 1- to 2-inch cap. It may appear as a single mushroom or in clusters.

Function

The Lepiota lutea mushroom breaks down dead organic matter in and on the soil. It will not harm the plant or soil, and removing the mushroom is not necessary for the health of the plant.

Warning

The Lepiota lutea mushroom is considered poisonous to people and animals. Iowa State University Extension suggests removing the mushroom from potted plants if there are pets and small children present.

References

• University of Wisconsin-La Crosse: Lepiota lutea; Tom Volk; February 2002
• Iowa State University Extension: Mushrooms in Houseplant Pots; Christine Engelbrecht; January 2007

Resources

• North Carolina Cooperative Extension Service: Wild Mushrooms and Poisoning; Larry F. Grand