Why does your Rhododendron degronianum have sudden leaf drop? Diagnose the cause and fix it with our step-by-step guide.
Excessive moisture or poor drainage in the acidic substrate can lead to fungal pathogens attacking the root system of this Yakushima native. As roots decay, the plant loses its ability to transport water, triggering an emergency leaf drop.
Rhododendron degronianum is adapted to the humid, temperate climate of Yakushima; sudden exposure to dry air or freezing temperatures can cause physiological stress. This rapid change triggers a defense mechanism where the plant sheds leaves to conserve moisture.
While they dislike waterlogging, these azaleas require consistent moisture. If the peat-based or acidic soil dries out completely, the plant will sacrifice its foliage to prevent total desiccation.
A lack of available nitrogen in acidic soils can lead to chlorosis followed by leaf abscission. This is common if the soil pH has drifted too high, making nutrients unavailable to the plant.
Your plant might also be experiencing one of these issues:
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