Fungus Gnats in Large Plant Collection: Leslie's Safe Approach

The Problem

Fungus gnats (soil gnats) live in moist potting soil, feeding on fungus. One infested plant spreads to all. They're a nuisance, not plant killers.

Leslie's Non-Chemical Plan

1. Dry the soil: Let pots dry between waterings. No fungus = no gnat food = no adults.
2. Yellow sticky traps: Catch flying adults. Non-toxic, safe for kids/pets.
3. Systemic granules (if needed): Applied to soil, kills larvae. Use with caution around pets.

What Didn't Work

Soapy water, coffee grounds, chewing tobacco — these add moisture/organics, worsening the problem.

Persistence

Dry soil + traps breaks the cycle. May take weeks.