Why does your Asplenium trichomanes have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
Pet FriendlyThe larvae of fungus gnats thrive in the moist, organic-rich substrate preferred by Asplenium trichomanes. The adults emerge to lay eggs in the top layer of soil, where their larvae feed on decaying organic matter and occasionally fine root hairs.
While Maidenhair Spleenwort loves humidity, a lack of drainage leads to anaerobic conditions that attract fungus gnats. Constant saturation prevents the substrate from aerating, creating a perfect breeding ground for fly larvae.
If the potting medium contains too much decomposing peat or compost, it provides an abundant food source for fly larvae. As this organic material breaks down, it releases gases and nutrients that attract adult flies to the fern's pot.
Your plant might also be experiencing one of these issues:
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