Why does your Rhododendron concinnum have sudden leaf drop? Diagnose the cause and fix it with our step-by-step guide.
Excessive moisture in the soil prevents oxygen from reaching the roots, leading to fungal pathogens that destroy the root system of this compact species. As the roots die, they can no longer support the foliage, causing a sudden release of leaves.
Rhododendron concinnum is sensitive to rapid environmental shifts. A sudden drop in temperature (frost) or an intense heatwave can trigger a physiological stress response, causing the plant to shed leaves to conserve moisture.
While they like moisture, compact rhododendrons cannot tolerate drying out completely. When the soil becomes bone-dry, the plant undergoes rapid transpiration loss and drops leaves to prevent total dehydration.
In highly acidic soils where nutrients are unavailable, the plant may undergo chlorosis before dropping leaves. A sudden lack of essential minerals can cause the plant to shed older foliage to redirect energy to new growth.
Your plant might also be experiencing one of these issues:
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