Houseplant fungus gnats may take multiple weeks to control because eggs and larvae in potting mix keep producing new adults. Removing only the visible flying insects rarely solves the problem.
What to do during the next few weeks
- Allow the surface of suitable potting soil to dry between waterings while respecting the plant’s needs.
- Remove soggy debris and correct pots that remain waterlogged.
- Use yellow sticky cards to monitor and trap flying adults, not as the sole treatment.
- For persistent infestations, consider labeled biological controls intended for fungus-gnat larvae, following all product instructions.
- Check nearby plants so one missed pot does not restart the cycle.
What to avoid
Do not intentionally dehydrate a plant that requires consistently moist soil. Control measures should fit the plant species and the infestation.
Frequently asked question
Why are adults still appearing after I cleaned?
Larvae already in the soil may mature over the following days or weeks. Watch whether numbers decline over a full life cycle.
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