Why does your Lilium orientalis Lake Michigan 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 breed in the moist organic matter of lily potting soil. Their larvae feed on decaying plant material and can damage the delicate root hairs of Oriental Lilies, leading to nutrient deficiency.
Oriental Lilies prefer well-drained soil; however, if the medium remains saturated, it creates the perfect breeding ground for fungus gnats. Persistent moisture also increases the risk of Botrytis blight in 'Lake Michigan' blooms.
A potting mix too rich in uncomposted peat or compost can attract flies looking for organic food sources. While lilies love nutrients, overly decomposed material provides the ideal substrate for insect larvae.
Your plant might also be experiencing one of these issues:
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