Why does your Hydrangea macrophylla Magical Sunshine have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
Hydrangeas are sensitive to soil pH; if the soil is too alkaline (above 6.5), iron becomes chemically locked away from the roots, causing new leaves to turn yellow while veins remain green.
Magical Sunshine varieties require consistent moisture but are highly susceptible to root rot if the soil does not drain well, leading to leaf yellowing as roots die off.
A lack of available nitrogen prevents the plant from producing chlorophyll, typically resulting in a uniform yellowing that starts with older, lower leaves first.
Sudden extreme temperature fluctuations can cause the hydrangea to undergo physiological stress, leading to temporary chlorosis as the plant enters a defensive state.
Your plant might also be experiencing one of these issues:
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