Why does your Hydrangea macrophylla Magical Ouverture have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
This is common in Hydrangeas when soil pH is too high (alkaline), preventing the plant from absorbing iron. The interveinal chlorosis (yellow leaves with green veins) is a classic sign of nutrient lockout in acidic-loving species.
Hydrangea macrophylla has high water requirements but is highly susceptible to root rot if soil does not drain well. Excess moisture deprives roots of oxygen, causing the leaves to turn pale yellow before dropping.
A lack of nitrogen prevents the production of chlorophyll throughout the entire leaf. In large-leafed cultivars like 'Magical Ouverture', this often manifests as a uniform yellowing of older leaves first.
While they love water, extreme drought causes the plant to shed chlorophyll to conserve moisture. This results in yellowing, often accompanied by wilting or crispy leaf edges.
Your plant might also be experiencing one of these issues:
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