Fungus Gnats from Poor Soil: Add Perlite for Drainage, Dry Soil Between Waterings, Kill Larvae with Alcohol Watering

Cause

Repotting soil was poor quality — too much peat, not enough air. Roots suffocate, rot, attract fungus gnats.

Fix

• Add perlite to potting soil for better drainage/oxygen.
• Let soil dry more between waterings; never leave saucer full.
• Water with rubbing alcohol to kill larvae without harming roots.