Peonies should be carefully cut back in the fall, ideally after the foliage has yellowed or been damaged by frost, which typically happens around October. This is an important step to help prevent disease and encourage strong growth in the coming spring. Cutting back the stems to ground level reduces the chance of fungal infections and clears the way for fresh growth. It's also a good idea to dispose of the plant debris rather than composting it, as this helps prevent any lingering pathogens from affecting the next season’s plants.
Once cut back, peonies are ready for a clean start come spring. Although peonies are hardy plants, this fall cleanup ensures that they’ll be free from diseases such as powdery mildew or botrytis, which can affect them if leftover foliage is left behind. Regular maintenance like this keeps your peonies strong, healthy, and ready to produce stunning blooms year after year.