Why does your Rhododendron hunnewellianum have sudden leaf drop? Diagnose the cause and fix it with our step-by-step guide.
As an acid-loving evergreen, Hunnewellianum is highly susceptible to waterlogged soil. Excessive moisture suffocates the roots, leading to a rapid failure of the plant's hydraulic system and sudden defoliation.
Sudden shifts from warm days to hard freezes can cause physiological shock in Rhododendrons. This stress triggers a defense mechanism where the plant sheds leaves to conserve moisture and energy.
Rhododendrons have shallow root systems that cannot access deep water. If the substrate dries out completely, the plant will drop leaves rapidly to prevent further transpiration and permanent wilting.
While usually characterized by spotting first, a heavy infection of fungal pathogens can lead to premature leaf senescence and dropping. This is common in high-humidity environments where air circulation is poor.
Your plant might also be experiencing one of these issues:
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