Knowledgebase
H substance is my yard. #937248
Asked June 29, 2026, 5:15 PM EDT
Ionia County Michigan
Expert Response
This is slime mold. If requires no treatment. You can brush, rake, mow, or rinse it off with a hose. If you use the hose, do so at a time when grass leaves will dry quickly in the sun. You don’t want grass standing overnight wet, or more fungi will be encouraged.
https://ohioline.osu.edu/factsheet/HYG-3074
https://www.canr.msu.edu/ipm/diseases/slime-mold