Slime Mold on Lawn: Harmless Black Dust That Washes Away

Black dust on shoes and brooms after walking on Bermuda grass in spring is likely slime mold spores. Cool nights, warm days, and moisture trigger these harmless fungi that decompose thatch.

What It Is

Slime molds (myxomycetes) are not true fungi but protists. They creep over grass blades, then produce powdery spores—black, gray, or yellow.

Simple Control

Wash off with a hose. No chemicals needed. It disappears as weather dries.

Harmless slime mold

Key Point

Slime mold is cosmetic only—no harm to grass, pets, or people. Just rinse and forget.