Fix kit
Fungus gnats
Tiny dark flies around the pot are usually fungus gnats. The adults are a nuisance; their larvae live in constantly moist potting mix.
What to do
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1 Let the top of the potting mix dry out between waterings and empty the saucer. Constantly wet mix is what gnat larvae need.
Shows how wet the soil is at root level, so you water when it is actually needed.
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2 Hang or stick yellow sticky traps by the pot to catch adults and see how many are around.
Yellow traps that catch adult fungus gnats flying around the pot.
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3 Treat the mix for larvae with a Bti product (Bacillus thuringiensis israelensis), repeating as the label says.
BTI granules for the soil; the label covers fungus gnats in pots.
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4 Clear dead leaves off the soil, and use fresh, sterile mix when you repot.
A ready-made indoor potting mix for repotting.
Sources: UC IPM: Fungus gnats
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