Why does your Geranium ibericum have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
Geranium ibericum is sensitive to waterlogged soil, which leads to anaerobic conditions. Excessive moisture causes the roots to decay, preventing the plant from transporting nitrogen and magnesium, resulting in chlorosis.
A lack of available nitrogen prevents the synthesis of chlorophyll. In Iberican Geraniums, this typically manifests as a uniform yellowing of older leaves first as the plant mobilizes nutrients to new growth.
If the soil pH is too high (alkaline), iron becomes chemically unavailable to the plant. This results in interveinal chlorosis, where leaf veins remain green while the rest of the tissue turns yellow.
Extreme fluctuations in temperature or sudden cold snaps can disrupt metabolic processes in Geranium ibericum. This stress often triggers the degradation of chlorophyll as a defense mechanism.
Your plant might also be experiencing one of these issues:
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