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Hydrangea macrophylla
Growing calendar
Typical timing for central Japan (Kanto region). Shift it for your own climate, and record your actual dates.
Guides
- When to Prune Hydrangeas and Why Yours Did Not Flower
- How to Turn Hydrangeas Blue or Pink: Soil pH and Aluminum
- Types of Hydrangea: How to Tell Them Apart in Your Garden
- Hydrangea Care: Watering, Feeding and Reading Wilted Leaves
- Hydrangea Year: What to Do Each Season, and When
- How to Propagate Hydrangeas from Cuttings and Layering
Pests and diseases (4)
Problems recorded for this plant, most serious first.
Powdery Mildew
MajorDisease
White patches appear scattered on the upper leaf surface at first, then the whole leaf is coated in a white powder. Leaves later yellow, brown and die back, and reduced photosynthesis cuts growth and yield.
Spider Mites
MajorPest
Fine white stippling spreads across the upper leaf surface, and the leaf eventually whitens and dies back. In heavy infestations fine webbing appears on leaf undersides and shoot tips.
Scale Insects
CommonPest
Small white or brown shell-like insects dot the shoots and leaves. The plant loses vigor and honeydew-fed sooty mold blackens the shoots and foliage.
Anthracnose
CommonDisease
Light brown to dark brown round lesions with sharp margins form on leaves and fruit, slightly sunken in the center. In wet weather salmon-pink slimy spore masses ooze out on the lesions.
