Why does your Hydrangea macrophylla Magical Amethyst have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
This cultivar requires acidic soil to maintain health; if the soil pH is too high (alkaline), the plant cannot absorb iron, causing interveinal yellowing on new leaves.
Hydrangeas have high transpiration rates but are prone to root rot if soil stays saturated, which prevents oxygen from reaching roots and leads to systemic yellowing.
A lack of nitrogen prevents the production of chlorophyll, often manifesting as a uniform yellowing that starts on older, lower leaves first.
While 'Magical Amethyst' loves moisture, extreme dry spells cause the plant to shed chlorophyll and wilt, eventually leading to yellowing and leaf drop.
Your plant might also be experiencing one of these issues:
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