Fungus Gnats in Peace Lily: Complete Control Guide

Understanding the Infestation

Tiny flies (fungus gnats) and soil-dwelling larvae indicate consistently wet soil. Larvae feed on decaying roots and organic matter. Adults live ~1 week; the cycle continues in moist conditions.

Step-by-Step Elimination

1. Remove loose top soil: Discard the upper ½–1 inch not in direct contact with roots. This removes many larvae.
2. Do not replace the soil. Disturbing roots worsens stress.
3. Add sharp sand barrier: ¼ inch of builder's sand on the soil surface. Sharp edges damage larvae; dry surface deters egg-laying.
4. Water only when wilting begins: Then water less than usual. Peace lilies signal thirst by drooping.
5. Yellow sticky traps: Catch flying adults near the plant.

Water Quality & Outdoor Exposure

• Use filtered/distilled water if tap water is hard.
• Do not place outside in rain—excess moisture worsens the problem.

About the Worm in Your Friend's Plant

Earthworms in nursery pots indicate non-sterile soil but don't harm plants. Repotting damages delicate root hairs—avoid unless absolutely necessary.

For pest and peace lily care guides, email the author.