Why does your Rhododendron kaempferi have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
Azaleas are acid-loving plants; if the soil pH rises above 5.5, the plant cannot absorb iron, leading to interveinal yellowing while veins remain green. This is the most common cause of yellowing in Rhododendron kaempferi.
Rhododendrons have shallow, fibrous root systems that are highly susceptible to suffocation. Excessive moisture leads to Phytophthora or Pythium infections, causing leaves to turn yellow and eventually drop.
A lack of nitrogen prevents the production of chlorophyll, resulting in a uniform yellowing of older leaves. This often occurs in depleted or highly leached acidic soils used for container-grown azaleas.
If planted in a container that is too small, the dense root mass prevents water and nutrient infiltration. This physiological stress manifests as general chlorosis and stunted growth in Pincushion Azaleas.
Your plant might also be experiencing one of these issues:
English
Italiano
