Why does your Geranium x Magnificum 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 topsoil of Zonal Geraniums. Their larvae feed on organic matter and can damage the delicate root hairs of the geranium, leading to stunted growth.
Excessive moisture in the potting medium creates an ideal breeding ground for fungus gnat larvae and promotes fungal pathogens. Zonal Geraniums prefer well-draining soil, and constant dampness is a primary trigger for fly infestations.
Old, dead leaves or uncomposted organic matter at the base of the Geranium provide a food source for fly larvae. If the plant has not been pruned, the buildup of debris can sustain a localized insect population.
Your plant might also be experiencing one of these issues:
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