Slime Mold on Mulch: Harmless and Easy to Remove

What It Is

A slime mold—bubbly white/yellow crust, brown powder underneath, no roots. Scrapes off easily. Totally harmless to plants.

Management

• Blast with hose jet.
• Or rake surface to break it up.
• May return; just repeat.

Why It Appears

Common on decomposing mulch. Some grow visibly fast (cover a stump in a day).