Why does your Rhododendron minus have sudden leaf drop? Diagnose the cause and fix it with our step-by-step guide.
Rhododendrons have shallow, fibrous root systems that are highly sensitive to moisture fluctuations. Sudden leaf drop occurs when the roots either dry out completely or suffer from oxygen deprivation due to waterlogged soil, leading to rapid physiological shutdown.
This soil-borne oomycete thrives in heavy, poorly draining soils common to many dwarf rhododendron habitats. The pathogen attacks the fine feeder roots, preventing water uptake and causing the plant to shed leaves rapidly as if it were drought-stricken.
Sudden drops in temperature or late spring frosts can damage the delicate leaf tissue of dwarf cultivars. The plant responds to cellular damage by abscising leaves to conserve energy and protect the core woody structure.
While usually a slower process, extreme nutrient depletion in acidic-loving plants can lead to leaf senescence. If the soil pH has drifted too high, the plant cannot uptake iron, causing leaves to yellow and eventually drop.
Your plant might also be experiencing one of these issues:
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