Why does your Rhododendron alabamense have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
Rhododendrons are acid-loving plants; if the soil pH rises above 6.0, iron becomes chemically unavailable to the roots. This leads to interveinal chlorosis where leaves turn yellow while veins remain dark green.
Excessive moisture in heavy soils deprives the roots of oxygen, causing root decay. This prevents the Alabama Azalea from transporting nutrients, resulting in overall leaf yellowing and eventual wilting.
A lack of available nitrogen in the growing medium prevents the production of chlorophyll. Unlike iron chlorosis, nitrogen deficiency typically causes a uniform yellowing starting from the older, lower leaves.
Fungal pathogens like Phytophthora can attack the root system in poorly drained environments. As the vascular system fails, the plant cannot sustain foliage, leading to yellowing and leaf drop.
Your plant might also be experiencing one of these issues:
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