Why does your Hydrangea macrophylla Magical Charlotte have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
In Hydrangea macrophylla, yellowing between the veins while veins remain green is a classic sign of iron deficiency, often caused by high soil pH (alkaline) which locks out nutrients. This prevents the plant from producing chlorophyll necessary for photosynthesis.
Excessive moisture in the soil displaces oxygen, leading to anaerobic conditions that cause root rot. When roots decay, they can no longer transport water and nutrients to the foliage, resulting in overall leaf yellowing.
A lack of available nitrogen in the growing medium causes older, lower leaves to turn uniformly yellow before progressing up the plant. This is common in heavy-feeding varieties like 'Magical Charlotte' if the soil organic matter has depleted.
While hydrangeas love morning sun, excessive intense afternoon sun can cause leaf scorch and chlorosis in 'Magical Charlotte'. The heat stress disrupts the metabolic processes of the large hydrangea leaves.
Your plant might also be experiencing one of these issues:
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