By The Old House Web


Crown rot causes black lesions at the base of the stem. The rot extends upward into the flower stalks, then the leaves and flowers wilt. Avoid overwatering, use a light porous soil, do not plant too deep, and avoid packing the soil closely around the stem.

Powdery mildew causes a grayish-white, mealy growth on the leaves. The infected part dries out and the leaves die.

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