Why does your Rhododendron Aberconwayi have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
As an acid-loving plant, Rhododendron 'Aberconwayi' requires a low soil pH to uptake iron. If the soil is too alkaline, iron becomes chemically unavailable, causing interveinal yellowing while veins remain green.
Excessive soil moisture or poor drainage leads to oxygen deprivation in the roots. This impairs the plant's ability to transport nutrients, resulting in overall leaf yellowing and eventual wilting.
A lack of nitrogen prevents the formation of chlorophyll, leading to a uniform pale yellowing of older leaves first. This is common in heavily leached soils or after heavy rainfall washes nutrients away.
Rhododendrons have shallow root systems that are highly susceptible to drying out. Prolonged drought causes the leaves to lose turgor pressure and turn yellow before dropping.
Your plant might also be experiencing one of these issues:
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