What does a diseased hydrangea look like?
What does a diseased hydrangea look like? Powdery mildew (Microsphaera penicillata) can occur on all hydrangeas but is most serious on bigleaf hydrangea. In addition to the usual white, powdery fungal growth on the leaf surfaces, yellow or purple leaf blotches might be present. A pH of 7 is neutral, and household vinegar has a […]
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