Why does your Mentha requienii have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The larvae of fungus gnats live in the top layer of moist soil and feed on organic matter and plant roots. In Corsican Mint, which requires high humidity and consistent moisture, these flies thrive because the substrate is rarely allowed to dry out.
The presence of tiny flies often indicates an overabundance of decomposing organic matter in the potting mix. For a moisture-loving plant like Mentha requienii, the damp, decaying peat or compost provides an ideal breeding ground for fly larvae.
While not the direct cause of the flies, excessive moisture in Mentha requienii can lead to fungal growth and root decay. This decaying organic matter creates a nutrient-rich environment that attracts fungus gnats to the plant.
Your plant might also be experiencing one of these issues:
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