Why does your Hydrangea macrophylla Magical Cleopatra have white cottony spots? Diagnose the cause and fix it with our step-by-step guide.
These small, soft-bodied insects secrete a white, waxy, cottony substance to protect themselves while feeding on the sap of the hydrangea stems and leaf undersides. Infestations can lead to leaf yellowing and stunted growth in Mophead varieties.
Scale insects produce a white, fluffy coating that resembles cotton clumps on the plant surface. They attach themselves to the hydrangea's woody stems and suck nutrients, often leaving behind a sticky residue known as honeydew.
While typically appearing as a fine dust, certain stages of fungal growth can look like fuzzy or cottony patches on hydrangea foliage. This is common in humid environments where air circulation around the large Mophead blooms is poor.
Your plant might also be experiencing one of these issues:
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