Why does your Rhododendron calendulaceum have drooping leaves? Diagnose the cause and fix it with our step-by-step guide.
As an acid-loving native species, Flame Azaleas have shallow root systems that are highly sensitive to moisture fluctuations. Drought causes cells to lose turgor pressure leading to wilting, while overwatering leads to Phytophthora root rot which physically prevents water uptake.
In poorly drained soils, fungal pathogens like Phytophthora attack the fine feeder roots of Rhododendrons. This destroys the plant's ability to transport water, resulting in permanent drooping even when the soil is wet.
Rhododendron calendulaceum requires acidic soil (pH 4.5-6.0) to access essential micronutrients like iron. If the pH rises too high, iron chlorosis occurs, which can weaken the structural integrity of the stems and cause drooping.
Extreme summer heat can cause rapid transpiration rates that exceed the plant's ability to pull water from its shallow roots. This results in temporary wilting during peak daylight hours as a defense mechanism.
Your plant might also be experiencing one of these issues:
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