Why does your Hydrangea macrophylla Magical Canzone have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
In Hydrangeas, yellowing leaves with prominent green veins typically indicate that the soil pH is too high (alkaline), preventing the plant from absorbing iron. This species requires acidic to neutral soil to maintain chlorophyll production.
Hydrangeas have high transpiration rates but are highly susceptible to root rot if the soil remains saturated. Excessive moisture deprives roots of oxygen, leading to systemic yellowing across the foliage.
A lack of available nitrogen in the soil prevents the production of chlorophyll, causing older leaves to turn uniformly pale yellow before progressing to newer growth. This is common in exhausted or heavily leached soils.
While 'Magical Canzone' loves moisture, extreme drought causes the plant to shed chlorophyll and wilt to conserve water. This can result in rapid yellowing and leaf drop during hot summer months.
Your plant might also be experiencing one of these issues:
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