Why does your Rhododendron simsii have sudden leaf drop? Diagnose the cause and fix it with our step-by-step guide.
As an acid-loving plant, Rhododendron simsii is highly susceptible to waterlogged soil which promotes Phytophthora species. This fungal pathogen destroys the fine root hairs, causing the plant to shed leaves rapidly as it can no longer transport water.
Indian Azaleas are sensitive to sudden changes in their microclimate, such as a cold snap or recent movement to a sunnier spot. This physiological stress triggers an immediate abscission of leaves to conserve moisture.
While they dislike wet feet, Rhododendrons have shallow root systems that dry out quickly. If the substrate becomes desiccated, the plant will drop leaves to reduce transpiration surface area.
Certain fungal pathogens target the foliage of R. simsii, particularly in humid conditions with poor airflow. The infection can progress so rapidly that the plant drops entire branches or leaves to mitigate the spread.
Your plant might also be experiencing one of these issues:
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