Why does your Asplenium scolopendrium have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
Pet FriendlyThe presence of tiny black flies around the soil surface in a moisture-loving fern like Asplenium scolopendrium usually indicates fungus gnats. Their larvae thrive in the damp, organic-rich substrate that Hart's-tongue ferns require, feeding on decaying organic matter and occasionally fine root hairs.
While this fern enjoys humidity, excessively wet soil creates an ideal breeding ground for moisture-dependent insects. Constant saturation can lead to anaerobic conditions, attracting flies that thrive in decomposing organic material.
If you have recently added fresh compost or bark to the fern's pot, the flies may be attracted to the newly available decomposing nutrients. The larvae use this organic matter to complete their life cycle, often appearing as a nuisance near the foliage.
Your plant might also be experiencing one of these issues:
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