Why does your Hydrangea macrophylla Magical Green Waves have sudden leaf drop? Diagnose the cause and fix it with our step-by-step guide.
Hydrangea macrophylla species have large, thin leaves with high transpiration rates. If the soil dries out too quickly, the plant will shed leaves to conserve moisture and prevent total vascular collapse.
Excessive moisture in poorly draining soil can lead to fungal pathogens attacking the roots. When roots die, they can no longer support the large leaf surface area of the 'Green Waves' cultivar, causing sudden defoliation.
Sudden drops in temperature or late spring frosts can cause physiological stress in Macrophylla hydrangeas. This triggers a survival mechanism where the plant sheds leaves to protect the main stem and root system.
While less common for 'sudden' drop, a severe lack of mobile nutrients can lead to chlorosis followed by leaf senescence and abscission as the plant reallocates resources to new growth.
Your plant might also be experiencing one of these issues:
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