Why does your Hydrangea macrophylla Magical Green Waves have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
This cultivar requires acidic soil to maintain nutrient availability; if the soil pH is too high (alkaline), the hydrangea cannot absorb iron, causing interveinal yellowing on new leaves.
Excessive moisture in the soil prevents oxygen from reaching the roots, leading to root rot which disrupts the transport of nutrients throughout the plant.
A lack of nitrogen in the soil prevents the production of chlorophyll, typically manifesting as a uniform yellowing that starts on older, bottom leaves first.
Hydrangeas have large, thin leaves with high transpiration rates; extreme dry spells cause the plant to sacrifice older leaves to conserve moisture.
Your plant might also be experiencing one of these issues:
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