Why does your Canna Rose 7106 have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely fungus gnat adults, which thrive in the moist, organic-rich soil that Canna lilies prefer. Their larvae feed on decaying organic matter and can damage the delicate root systems of your Rose Canna.
Canna lilies require high humidity and moist soil, but overwatering creates the perfect anaerobic environment for fungus gnat breeding. Constant wetness prevents oxygen from reaching the rhizomes, making them susceptible to rot.
If you have recently added compost or mulch to your Rose Canna pot, the decomposing organic material provides a primary food source for fly larvae. The smell of decaying matter attracts adult flies to lay eggs in the top layer of soil.
Your plant might also be experiencing one of these issues:
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