Why does your Mini Rose Sunny Star have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely the adult stage of fungus gnats, which thrive in the moist, organic-rich soil required by miniature roses. Their larvae feed on decaying organic matter and can damage the delicate feeder roots of 'Sunny Star'.
Excessive moisture in the potting medium creates the perfect breeding ground for fungus gnat larvae. Miniature roses are highly susceptible to root suffocation if the soil remains saturated for too long.
A recent addition of fresh compost or potting mix with high peat content can provide an immediate food source for insect larvae. The nutrient-dense environment attracts flies looking to lay eggs.
Your plant might also be experiencing one of these issues:
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