Fungus Gnats in Houseplants: How to Get Rid of Them Fast
Published on March 1, 2026
Fungus gnats in houseplants are frustrating but fixable. Learn a practical treatment plan that targets adults and larvae to stop reinfestation.
Fungus Gnats in Houseplants: How to Get Rid of Them Fast
Fungus gnats are more annoying than dangerous, but they multiply quickly in consistently wet soil.
Quick answer: Dry the topsoil more between waterings, trap adults, and treat larvae in the soil to break the cycle.
How to Confirm Fungus Gnats
- Tiny black flies around pots
- Adults resting on soil surface
- More activity after watering
Effective Treatment Stack
- Watering correction: allow top layer to dry more.
- Yellow sticky traps: reduce flying adults.
- Larval control: use a soil-targeted treatment repeatedly.
- Sanitation: remove decaying plant material from soil surface.
2-Week Plan
- Day 1: traps + larval treatment
- Day 4–5: recheck and repeat soil treatment
- Day 7: refresh traps
- Day 10–14: continue until activity drops to near zero
Prevention
- Avoid chronically wet topsoil
- Improve drainage and airflow
- Bottom-water when appropriate
- Quarantine new plants
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