Why does your Hydrangea macrophylla Magical Opal 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. This is common in alkaline soils where 'Magical Opal' cannot access available iron.
Hydrangeas require consistent moisture but are highly susceptible to root rot if the soil does not drain well. Excessive water displaces oxygen in the soil, leading to yellowing of older leaves as roots begin to decay.
A lack of nitrogen causes a more uniform yellowing of the entire leaf, starting with older, lower leaves. This occurs when the soil lacks organic matter or has been depleted by heavy seasonal growth.
Extreme summer heat can cause leaves to lose chlorophyll and turn yellow, especially if the 'Magical Opal' is in a location with afternoon sun exposure. This often accompanies crispy, brown edges on the yellowing leaves.
Your plant might also be experiencing one of these issues:
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