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Tiny flies around houseplants? Check for fungus gnats and damp soil

Constantly wet potting mix can encourage fungus gnats. Adjust watering for your plant and use yellow sticky cards to monitor adults; traps alone do not solve the source.

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University of Minnesota Extension notes that fungus gnats favor damp potting soil and are usually a nuisance rather than a serious threat to healthy plants. They can resemble fruit flies, so identify the source first. Begin with watering and drainage rather than unverified chemical mixes.

Your try-it-at-home checklist

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Watch where the tiny flies appear: near potting soil, fruit or a drain. Confirm the likely source before deciding they are fungus gnats.
Check the moisture needs of your plant. For species that tolerate surface drying, allow a suitable interval between waterings without wilting the plant.
Check for drainage holes and empty water collected in saucers. Reduce persistent wetness around the root zone.
Remove fallen leaves and decaying plant debris from the soil surface and inspect nearby pots.
Use yellow sticky cards to monitor and catch some flying adults; keep the adhesive away from children and pets. Cards are not a stand-alone cure.
For persistent problems, consider clean containers and suitable fresh potting mix. If you contemplate pesticides, check local approvals and the label for that plant, and seek qualified advice.

Your try-it-at-home checklist

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