Why does your Rhododendron arboreum have sudden leaf drop? Diagnose the cause and fix it with our step-by-step guide.
This water mold attacks the root system of Rhododendron arboreum, especially in poorly drained soils. As roots decay, the tree loses its ability to transport water, resulting in rapid leaf senescence and sudden shedding.
While these trees prefer consistent moisture, a sudden lack of water in the substrate causes the tree to enter survival mode. To reduce transpiration, the tree will rapidly shed its older leaves to conserve internal moisture.
Rhododendron arboreum is sensitive to extreme temperature fluctuations. A sudden late spring frost can damage leaf tissue, or an intense heatwave can cause rapid transpiration that the roots cannot keep up with, triggering leaf drop.
Chronic lack of essential nutrients can weaken the tree's structural integrity. While usually a slower process, severe deficiencies can lead to a sudden failure of the leaf petioles during periods of high metabolic demand.
Your plant might also be experiencing one of these issues:
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