Why does your Hydrangea macrophylla Magical Coral have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
This is the most common cause for 'Magical Coral' hydrangeas. When soil pH is too high (alkaline), the plant cannot absorb iron, resulting in bright yellow leaves with distinct green veins.
Hydrangeas require consistent moisture but are highly susceptible to root rot if the soil does not drain well. Excess water displaces oxygen in the soil, causing leaves to lose chlorophyll and turn yellow.
A lack of nitrogen prevents the production of chlorophyll. Unlike iron chlorosis, nitrogen deficiency usually causes a uniform yellowing that starts with the older, lower leaves first.
Extreme summer heat can cause transpiration to outpace water uptake. This stress often manifests as yellowing leaves, which may eventually develop crispy, brown edges.
Your plant might also be experiencing one of these issues:
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