Eliminating Fungus Gnats: A Step-by-Step Soil-Drying Method

The Pest: Fungus Gnats

Margaret asked how to get rid of tiny flying black bugs on her houseplants. Will Creed identified them as fungus gnats—adults live about a week; the real problem is larvae in soil feeding on decaying organic matter (often rotting roots).

Non-Chemical Control Protocol

1. Remove loose surface soil – discards many larvae.
2. Apply thin layer of sharp sand (builder's or river sand) – sharp edges damage larvae as they move upward.
3. Dry soil thoroughly – water only when plant is near wilting. Deprives larvae of moisture.
4. Monitor – expect gradual decline over ~2 weeks.

Additional Resource

Will offers a free article on indoor plant pests (including fungus gnats) via email: wcreed@HorticulturalHelp.com.