Why does your Geranium have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The presence of tiny black flies in Zonal Geraniums is almost certainly due to fungus gnats, which lay eggs in the top layer of moist organic matter. The larvae feed on decaying organic material and fine root hairs, potentially weakening the plant's stability.
Fungus gnat populations explode when Geranium soil is kept consistently wet, as they require high humidity for larval survival. Frequent overwatering creates the perfect anaerobic environment for both the flies and potential root rot.
Geranium potting mixes containing high amounts of peat moss or compost provide an ideal breeding ground for fly larvae. If the medium is too rich and stays moist, it becomes a continuous food source for the pests.
Your plant might also be experiencing one of these issues:
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