Why does your Hyacinthus orientalis City of Haarlem have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The presence of tiny black flies in hyacinth pots is almost certainly due to fungus gnats, whose larvae live in the upper layers of organic-rich soil. They thrive in the moist conditions required by Hyacinthus orientalis and feed on decaying plant matter or fine root hairs.
Hyacinths are prone to bulb rot if left in waterlogged soil. High moisture levels promote the growth of fungi and organic decay, which provides the primary food source and breeding ground for fungus gnat larvae.
Peat-based or heavily composted potting mixes used for spring bulbs offer an ideal substrate for insect egg-laying. The abundance of decomposing organic material in the 'City of Haarlem' container supports a larger population of flies.
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