Why does your Hydrangea macrophylla Sneeuwbal have sudden leaf drop? Diagnose the cause and fix it with our step-by-step guide.
Hydrangeas have large leaves with high transpiration rates; sudden leaf drop is a common defense mechanism when the roots are either desiccated by dry soil or suffocated by waterlogged conditions. Both extremes prevent the plant from maintaining turgor pressure.
Sudden shifts in temperature, particularly late spring frosts or intense heat waves, can trigger a stress response in Sneeuwbal varieties. This causes the plant to shed leaves to conserve moisture and energy during extreme thermal fluctuations.
If the soil does not drain well, fungal pathogens can attack the root system of the Hydrangea. As roots die, they can no longer support the large foliage, leading to rapid leaf senescence and drop.
A lack of available nitrogen prevents the plant from maintaining chlorophyll and structural integrity in its leaves. While usually a slower process, severe deficiency can manifest as rapid yellowing followed by leaf drop.
Your plant might also be experiencing one of these issues:
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