Why does your Hydrangea macrophylla Magical Marble have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
In Hydrangeas, yellow leaves with prominent green veins often indicate iron deficiency caused by high soil pH. When the soil is too alkaline, the plant cannot absorb iron even if it is present in the substrate.
Hydrangeas require consistent moisture but are highly susceptible to root rot if soil remains waterlogged. Lack of oxygen in the rhizosphere prevents nutrient transport, leading to generalized leaf yellowing.
A lack of nitrogen causes older, lower leaves to turn a uniform pale yellow before progressing up the plant. This is common in heavy-feeding species like Hydrangeas when soil organic matter is depleted.
Sudden shifts from cold night temperatures to intense direct sunlight can cause physiological stress in 'Magical Marble' varieties, leading to temporary chlorosis as the plant struggles to regulate transpiration.
Your plant might also be experiencing one of these issues:
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