Managing Mold on Houseplant Soil

What Is It?

Surface mold (fungus) appears when spores in the potting mix encounter favorable conditions: moisture, low light, organic matter. It's generally harmless to the plant but unsightly.

Removal and Prevention

1. Scrape off the moldy top layer plus any loose soil.
2. Top-dress with ½ inch of coarse sand, perlite, or decorative gravel to discourage regrowth.
3. Dry the surface: Water only when the top inch is dry. Water deeply, less frequently.
4. Increase light: Move plant closer to a window (if suitable for the species).
5. Air circulation: A small fan on low helps.

If It Persists

Commercial soil drenches (fungicides) exist but are rarely needed. Addressing moisture and light usually resolves it.

Check your watering habits—overwatering is the root cause.