Why does your Rhododendron arboreum have drooping leaves? Diagnose the cause and fix it with our step-by-step guide.
As a species that prefers well-drained but moist acidic soil, overwatering in heavy clay can cause Phytophthora root rot. This destroys the fine feeder roots, preventing water uptake and causing the leaves to wilt even if the soil is wet.
Rhododendron arboreum has large, leathery leaves with high transpiration rates. If the soil dries out completely, the tree loses turgor pressure rapidly, leading to characteristic drooping.
This tree requires high oxygen levels around its root zone. Compacted soil prevents gas exchange and limits root expansion, leading to physiological wilt symptoms throughout the canopy.
Certain fungal pathogens specifically target Rhododendron species, causing leaf wilt and eventual dieback of the branches. This is often accompanied by dark spots or lesions on the foliage.
Your plant might also be experiencing one of these issues:
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