Why does your Hydrangea macrophylla Glowing Alps have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
In hydrangea species, yellowing between the veins (interveinal chlorosis) often occurs when high soil pH prevents the uptake of iron. This is particularly common in alkaline soils where the 'Glowing Alps' cannot access essential micronutrients.
Excessive moisture in the soil prevents oxygen from reaching the roots, causing them to decay. As root health declines, the hydrangea can no longer transport nutrients upward, resulting in uniform yellowing of older leaves.
A lack of nitrogen in the growing medium causes the plant to mobilize nutrients from older leaves to new growth, leading to a pale yellowing that starts at the bottom of the plant.
Sudden shifts to intense, direct afternoon sun or extreme heat can cause the leaves to bleach and yellow as a defense mechanism against transpiration stress.
Your plant might also be experiencing one of these issues:
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