Why does your Hydrangea macrophylla Magical GreenFire have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
This hydrangea cultivar is highly sensitive to soil pH; if the soil is too alkaline, it cannot absorb iron. This results in interveinal chlorosis where leaves turn yellow while veins remain dark green.
Magical GreenFire requires consistent moisture but cannot tolerate 'wet feet.' Excessive water displaces oxygen in the soil, causing root rot which prevents the plant from transporting nutrients to the leaves.
A lack of nitrogen leads to a loss of chlorophyll, causing older leaves to turn a uniform pale yellow. This is common in heavy-feeding hydrangeas if the soil organic matter has been depleted.
Hydrangeas have large leaf surface areas that lose moisture rapidly through transpiration. Extreme drought stress causes the plant to sacrifice older leaves by withdrawing nutrients and moisture, leading to yellowing and wilting.
Your plant might also be experiencing one of these issues:
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