Why does your Mini Rose Rosa Terrazza Nena have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely fungus gnats, whose larvae thrive in the moist, organic-rich potting soil used for miniature roses. They feed on decaying organic matter and can damage the fine feeder roots of 'Nena' roses.
Miniature roses like 'Nena' require well-draining soil, but frequent overwatering creates the perfect breeding ground for moisture-loving insects. High humidity and wet topsoil surfaces encourage adult flies to lay eggs.
If the potting mix contains high amounts of unfinished compost or peat moss, it provides an ideal food source for larvae. This decomposition process attracts flies to the plant's root zone.
Your plant might also be experiencing one of these issues:
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