Why does your Hydrangea macrophylla Magical Kilimanjaro have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
High soil pH (alkaline) prevents this cultivar from absorbing iron, causing interveinal chlorosis where veins remain green while tissue turns yellow. This is common in hydrangeas planted in limestone-rich soils.
Excessive moisture in heavy soils displaces oxygen, leading to root decay that prevents water and nutrient transport. This often manifests as overall yellowing and wilting of the 'Magical Kilimanjaro' blooms.
A lack of nitrogen in the growing medium causes older, lower leaves to turn uniformly yellow before moving up the plant. This often happens if the soil organic matter has been depleted.
Hydrangeas macrophylla have high transpiration rates; extreme dryness causes leaf yellowing followed by crispy, brown edges. This is frequent during heat waves if the soil dries out completely.
Your plant might also be experiencing one of these issues:
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