Why does your Geranium psilostemon have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
Pet FriendlyGeranium psilostemon is drought-tolerant and prone to root rot if the substrate remains saturated. Excess moisture deprives the roots of oxygen, leading to chlorosis (yellowing) as the plant can no longer transport nutrients.
A lack of available nitrogen prevents the synthesis of chlorophyll in the older leaves. In Geraniums, this typically manifests as a uniform yellowing that starts on bottom leaves and moves upward.
As a species that can tolerate cool weather but not frost, sudden drops in temperature can cause metabolic disruption. This stress often leads to the breakdown of chlorophyll, resulting in yellowing foliage.
If the soil pH is too high (alkaline), Geranium psilostemon cannot uptake iron effectively. This results in interveinal chlorosis, where leaves turn yellow but the veins remain dark green.
Your plant might also be experiencing one of these issues:
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