White Mold on Houseplant Soil: Harmless but Fixable

Fluffy white mold on soil surface is a common fungus feeding on organic matter in damp conditions. It's not harmful to the plant but indicates overwatering or poor air circulation.

Simple Removal

• Scrape off the moldy top layer plus loose soil.
• Repeat as it reappears—usually stops once surface dries.
• Improve airflow around the plant.

Chemical Option

A soil drench with a houseplant fungicide (follow label) eliminates it faster if persistent.

Prevention

• Water only when top inch is dry.
• Use pots with drainage holes.
• Avoid peat-heavy mixes that stay wet.
• Don't let pots sit in water-filled saucers.

The mold came with the repotting soil—sterile mixes reduce but don't guarantee prevention.