Why does your Rhododendron hunnewellianum 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 plant, causing interveinal yellowing on new growth.
Excessive moisture or poor drainage in heavy soils can lead to fungal pathogens attacking the root system, disrupting water and nutrient transport to the foliage.
A lack of available nitrogen in the growing medium can cause older, more established leaves to turn uniformly pale yellow before progressing to the rest of the plant.
While Rhododendrons prefer moist soil, prolonged periods of complete drying can cause the plant to shed chlorophyll as a survival mechanism, leading to yellowing and leaf drop.
Your plant might also be experiencing one of these issues:
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