Preventing and treating iron toxicity in geraniums

Preventing and treating iron toxicity in geraniums

Bronze speckling, necrotic spots, and leaf edge necrosis on the bottom leaves of geraniums are caused by excessive iron and manganese in the leaves.

This occurs when the pH drops to below 5.5 and iron and/or manganese are taken up in excess by the plant. Some varieties of geranium are more susceptible than others.

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