Why does your Hydrangea macrophylla Magical Crimson have white cottony spots? Diagnose the cause and fix it with our step-by-step guide.
These small, sap-sucking insects produce a white, waxy, cottony secretion to protect themselves while feeding on the Hydrangea's stems and leaf undersides. Their feeding can cause leaves to yellow or drop.
Scale insects often appear as stationary white fuzzy masses on the stems of Hydrangeas. They extract nutrients from the plant, which can lead to stunted growth and leaf chlorosis.
While typically appearing as a dusty film, certain fungal outbreaks can manifest as tufted white patches on the foliage of Hydrangeas in high humidity. This fungus thrives in stagnant air around dense blooms.
Your plant might also be experiencing one of these issues:
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