In the fall, after the plant is dormant, dig it up and replant it correctly or move it to a sunnier spot. The most common plant diseases, like powdery mildew or botrytis, a fungal rot, appear on peony ...

These include bacterial blight, foliage becoming coated with a fungal powdery mildew, or root rot that entirely stunts growth ...

The most common plant diseases, like powdery mildew or botrytis, a fungal rot, appear on peony foliage and stems. Remove infected areas or treat the plant with a fungal spray. Peonies are not ...