By KnowYourPlant Editorial Team, updated June 24, 2026. This version keeps the guide aligned with extension and IPM guidance reviewed for the June 18, 2026 evidence refresh.
Start Here if You Need the Gnats Down Fast If you are standing over the pot right now and just want the first three moves, do these before you try anything fancy:
Put a yellow sticky trap in every suspect pot so you can see which container is actually feeding the outbreak. Let the top 1 to 2 inches of mix dry as much as the plant safely allows, then empty every saucer, cachepot, or reservoir holding leftover water. If adults return after the next watering, add a labeled larval treatment such as BTI or beneficial nematodes and focus on the wettest source pots first. If the plant is a seedling, fresh cutting, or already recovering from root stress, keep the dry-down gentler and lean harder on monitoring plus larval control.
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