Why does your Hydrangea macrophylla Magical Anouk 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 soil that Hydrangeas prefer. The adults emerge to breed in the top layers of the substrate, feeding on decaying organic matter and occasionally attacking fine root hairs.
Hydrangeas require consistent moisture, but overly saturated soil creates an anaerobic environment that promotes fungal growth. This dampness serves as the primary breeding ground for soil-dwelling pests like gnats.
Frequent application of decomposing organic matter, such as compost or manure, provides a high-nutrient food source for larvae. This can lead to an explosion in the population of small black flies near the base of the plant.
Your plant might also be experiencing one of these issues:
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