Why does your Achimenes have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely the adult stage of fungus gnats, which thrive in the moist, organic-rich soil typically used for Achimenes. Their larvae live in the top layer of soil and feed on decaying organic matter or fine root hairs.
Achimenes prefer consistent moisture but are highly susceptible to fungal growth when soil remains saturated. This creates a perfect breeding ground for fungus gnat larvae and can lead to rhizome rot.
If using a heavy peat-based potting mix, the breakdown of organic material provides the primary food source for the life cycle of soil pests. As the medium decomposes, it releases gases and nutrients that attract various dipteran species.
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