Why does your Rhododendron hippophaeoides have sudden leaf drop? Diagnose the cause and fix it with our step-by-step guide.
Rhododendrons require consistent moisture but are highly sensitive to soil saturation. Sudden leaf drop is a common defense mechanism when the roots are either desiccated by drought or suffocating due to anaerobic conditions from overwatering.
This soil-borne oomycete thrives in the cool, damp conditions often preferred by Rhododendron species. It attacks the root system, physically preventing the plant from supporting its foliage, leading to rapid wilting and leaf abscission.
Rhododendron hippophaeoides is hardy, but rapid fluctuations between extreme frost and sudden warmth can trigger a stress response. Sudden drops in temperature during bud break or unexpected heat waves cause the plant to shed leaves to conserve energy.
While nutrient deficiency usually causes chlorosis (yellowing) first, extreme depletion in acidic-loving plants can lead to premature leaf senescence and drop. This is particularly common in depleted or highly alkaline soils.
Your plant might also be experiencing one of these issues:
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