Why does your Hydrangea macrophylla Magical Ruby Red 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, often caused by high soil pH preventing nutrient uptake.
A lack of nitrogen causes the entire leaf blade, including the veins, to turn pale yellow, starting with older leaves at the base of the plant.
Hydrangeas require consistent moisture but cannot tolerate 'wet feet'; saturated soil deprives roots of oxygen, leading to yellowing foliage and wilting.
Low magnesium levels can cause yellowing on the edges of older leaves, which may eventually turn necrotic (brown) in Magically Ruby Red varieties.
Your plant might also be experiencing one of these issues:
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