Why does your Rhododendron calendulaceum have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
Flame Azaleas are acid-loving plants; if the soil pH rises above 5.5, iron becomes chemically unavailable to the roots, causing interveinal yellowing on new growth.
Excessive moisture or poor drainage in heavy soils leads to fungal pathogens attacking the root system, disrupting nutrient transport and causing overall leaf yellowing.
A lack of available nitrogen in the soil prevents chlorophyll production, typically resulting in a uniform yellowing that starts on older leaves first.
As a native woodland species, Flame Azaleas require consistent moisture; prolonged dry periods cause leaves to lose turgidity and turn yellow before dropping.
Your plant might also be experiencing one of these issues:
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