Why does your Rhododendron edgeworthii 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 5.5, iron becomes chemically unavailable to the roots. This leads to interveinal chlorosis where leaves turn yellow while veins remain dark green.
Excessive soil moisture or poor drainage causes Phytophthora species to attack the root system of Edgeworthii. This prevents water and nutrient transport, causing a general yellowing and eventual wilting of foliage.
While Edgeworthii is somewhat hardy, prolonged dry periods cause the plant to sacrifice older foliage to conserve moisture. This results in a gradual yellowing of the outer leaves followed by leaf drop.
A lack of nitrogen in the growing medium prevents the production of chlorophyll. Unlike iron chlorosis, nitrogen deficiency typically causes the entire leaf to turn a uniform pale yellow, starting with older leaves.
Your plant might also be experiencing one of these issues:
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