Why does your Pelargonium x domesticum Aztec have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely fungus gnat adults, which lay eggs in moist organic matter. Their larvae feed on the delicate root hairs of your Zonal Pelargonium, which can lead to nutrient deficiencies and stunted growth.
High moisture levels in the potting medium create the perfect breeding ground for fungus gnat larvae. For Pelargoniums, which prefer well-draining soil, constant wetness also increases the risk of Pythium root rot.
The presence of overly decomposed peat or a thick layer of decomposing mulch on top of the Pelargonium pot provides a nutrient-rich substrate for flies to breed.
Your plant might also be experiencing one of these issues:
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