Why does your Foeniculum vulgare have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
Pet FriendlyThe tiny black flies are likely fungus gnat adults, which breed in the moist organic matter of fennel's potting soil. Their larvae feed on decaying organic material and can damage the delicate root system of Fennel if populations explode.
Certain species of small flies are attracted to the aromatic oils and moisture of Fennel foliage. While they don't primarily target fennel, their presence often indicates a high-humidity environment that can lead to secondary fungal issues.
Excessive moisture causing root decay creates a breeding ground for scavengers and flies. As the Fennel roots rot, the smell of decomposing organic matter attracts various small dipterans.
Your plant might also be experiencing one of these issues:
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