Why does your Hydrangea macrophylla Magical Cerise have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
In Hydrangeas, yellowing between the veins (interveinal chlorosis) while veins remain green is a classic sign of iron deficiency. This often occurs in alkaline soils where high pH prevents the plant from absorbing iron.
A lack of nitrogen causes the entire leaf, starting from older, lower leaves, to turn a uniform pale yellow. This occurs when the soil lacks sufficient organic matter or nutrients have been leached by heavy watering.
Hydrangeas require moisture but cannot tolerate 'wet feet.' Excess water displaces oxygen in the soil, leading to root rot which prevents the plant from transporting nutrients, resulting in yellowing foliage.
While overwatering causes yellowing, extreme drought stress can cause leaves to lose chlorophyll and turn yellow before eventually browning. This is common if the 'Magical Cerise' is in a high-sun area without consistent moisture.
Your plant might also be experiencing one of these issues:
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