Why does your Heuchera micrantha have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
Pet FriendlyThe most common cause of tiny black flies in ornamental perennials like Heuchera is fungus gnats. Their larvae live in the top layer of soil and feed on organic matter or decaying plant roots, often thriving in the moist conditions Coral Bells prefer.
While not the flies themselves, overwatering Heuchera creates a damp, decaying environment that attracts fungus gnats. This excess moisture can lead to fungal pathogens in the rhizome of the Coral Bell.
Heuchera often grows in mulch-heavy beds. If there is decomposing leaf litter or uncomposted mulch at the base of the plant, it provides an ideal breeding ground for flies and their larvae.
Your plant might also be experiencing one of these issues:
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