Fungus Gnats on Houseplants: Dry Soil, Charcoal, and Potato Traps

Cause: Overwatering

Fungus gnats breed in wet soil. Larvae eat decaying roots/bark.

Multi-Pronged Fix

1. Drain pots fully (remove saucers). Let soil dry thoroughly.
2. Repot with added horticultural charcoal + perlite (improves drainage).
3. Top-dress with coarse coir, sand, or diatomaceous earth (sharp edges kill larvae).
4. Potato slices on soil surface attract larvae; discard daily.
5. Consider outdoor placement if season allows (more light = faster drying).

Prevention

Sterile, bark-free, well-draining mixes. Water only when needed.