Why does your Rhododendron hybridum hot 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, causing interveinal chlorosis where veins remain green but leaf tissue turns yellow.
Excessive moisture in heavy soil deprives roots of oxygen, leading to Phytophthora or Pythium infections which impair the plant's ability to transport nutrients.
A lack of nitrogen prevents the synthesis of chlorophyll, typically resulting in a more uniform yellowing that starts with older, lower leaves first.
High levels of salts from hard water or excessive synthetic fertilizers can burn the sensitive root system of Rhododendrons, leading to leaf yellowing and tip necrosis.
Your plant might also be experiencing one of these issues:
English
Italiano
