Why does your Hydrangea macrophylla Magical Crimson have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
In Hydrangeas, yellowing leaves with distinct green veins typically indicate an inability to absorb iron, often caused by high soil pH (alkaline). This prevents the plant from producing sufficient chlorophyll.
Excessive moisture in heavy soils deprives the roots of oxygen, leading to root rot. This prevents the 'Magical Crimson' variety from transporting nutrients upward, resulting in overall leaf yellowing.
A lack of nitrogen causes older, lower leaves to turn pale yellow first as the plant mobilizes nutrients to new growth. This is common in plants grown in nutrient-depleted or heavily leached soils.
While Hydrangeas prefer moist soil, prolonged dry periods cause the plant to lose turgor pressure and shed chlorophyll. This often presents as yellowing accompanied by wilting or crispy leaf edges.
Your plant might also be experiencing one of these issues:
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