Fungus gnats on houseplants
Common causes of fungus gnats and the first things to check, summarized from 23 PlantGrail care records across 21 plants (as of ).
What causes fungus gnats on houseplants?
It depends on the plant and how it is kept, so check the plant pages below. For Boston Fern, the records explain it like this: Fungus gnats infest Boston ferns when the soil surface remains consistently moist, providing an ideal breeding ground for larvae. These pests are attracted to organic matter in damp potting soil and are commonly introduced via nursery plants or contaminated soil. While gnats rarely kill plants directly, they indicate overwatering conditions that can lead to root rot in ferns.
Common first steps
- Apply Mosquito Bits (BTI) to the soil surface - sprinkle and water to activate the biological larvicide
- Allow the top 1-2 inches of soil to dry between waterings while maintaining ambient humidity
- Use yellow sticky traps near the soil surface to catch adult gnats
Plants with records for fungus gnats
Most records first. Open a plant for its own causes and fixes.
- pothos Epipremnum aureumRead the guide
- boston fern Nephrolepis exaltataRead the guide
- string of pearls Curio rowleyanusPlant care guide
- peace lily Spathiphyllum wallisiiRead the guide
- fiddle leaf fig Ficus lyrataPlant care guide
- snake plant Dracaena trifasciataRead the guide
- zz plant Zamioculcas zamiifoliaRead the guide
- calathea Goeppertia spp.Plant care guide
- bromeliad Bromeliaceae spp.Plant care guide
- phalaenopsis orchid Plant care guide
- bird of paradise Strelitzia reginaePlant care guide
- jade plant Crassula ovataPlant care guide
- rubber plant Ficus elasticaPlant care guide
- spider plant Chlorophytum comosumPlant care guide
- alocasia frydek Alocasia micholitziana 'Frydek'Plant care guide
- pink princess Philodendron erubescens 'Pink Princess'Plant care guide
- alocasia Alocasia spp.Plant care guide
- anthurium Anthurium spp.Plant care guide
- cast iron plant Cast Iron PlantPlant care guide
- parlor palm Chamaedorea elegansPlant care guide
- monstera deliciosa Monstera deliciosaRead the guide
Questions about fungus gnats
Which plants have the most records for fungus gnats?
pothos, boston fern, string of pearls, peace lily, fiddle leaf fig and 16 others.
Can fungus gnats be prevented?
Quarantine new plants for 2 weeks before introducing them to your collection. Use well-draining soil with perlite and maintain 60-80% ambient humidity via pebble trays rather than over-wetting soil. Top-dress soil with sand or perlite to deter egg-laying adults.
What are these records?
This page summarizes 23 PlantGrail care records on fungus gnats. Records describe care topics; they are not counts of observed plants or treatment outcomes.