Why does your Rhododendron oreotrephes have sudden leaf drop? Diagnose the cause and fix it with our step-by-step guide.
As an alpine species, R. oreotrephes requires excellent drainage; saturated soil leads to oxygen deprivation and fungal pathogens that destroy the fine feeder roots. This results in a sudden inability for the plant to support foliage, causing leaves to drop.
Sudden drops in temperature or late spring frosts can damage the delicate cellular structure of the leaves. The plant responds to this physiological shock by abscising (dropping) leaves to conserve moisture and energy.
While adapted to alpine environments, a total lack of moisture causes the plant to enter an emergency survival mode. To prevent complete desiccation, the rhododendron will shed leaves to reduce its overall transpiration surface area.
A sudden lack of available nitrogen, often due to leaching in high-drainage alpine mixes, can cause the plant to shed older leaves. This is a way for the plant to reallocate mobile nutrients from older foliage to new growth points.
Your plant might also be experiencing one of these issues:
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