Gray Marshmallow Masses on Tree: Harmless Lichens

Gray, marshmallow-like masses on every branch—these are lichens, a fungus-alga symbiosis. They are not pests.

What Lichens Indicate

• Good air quality (lichens don't grow in pollution).
• Tree bark is a substrate, not a food source.
• More visible on stressed/dying trees (more light), but not the cause.

Action

Fertilize tree, water during drought, mulch properly. Do not remove lichens—they're part of a healthy ecosystem.

Resource

Backyard Nature (backyardnature.net/lichens.htm) for more info.