Why does your Hosta clausa have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
These tiny black flies thrive in the moist, organic-rich soil that Hostas prefer. Their larvae feed on decaying organic matter and can occasionally damage the fine feeder roots of the Hosta clausa.
Often confused with fungus gnats, these flies specifically target high-moisture environments. In Hostas, their presence usually indicates the soil is staying wet for too long, which can lead to secondary issues like root rot.
While less common, certain flies are attracted to the moisture and decaying plant debris around the base of large-leaved plants like Hostas. They do not typically attack the hosta tissue itself but inhabit the immediate microclimate.
Your plant might also be experiencing one of these issues:
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