Fall is the ideal time to prune herbaceous and Itoh peonies, as they show signs of wilting and yellowing foliage. This process typically occurs after the first frost in late fall, allowing plants to enter dormancy without undue stress. Herbaceous peonies should be cut back between October and November, after the first frost and when the foliage has turned yellow.
To prune peonies in fall, use clean, sanitized pruning shears or scissors to remove all above ground. Tree peonies should not be cut back to the ground yearly but should be cut back in the fall when the leaves are no longer green. Once the plants start to yellow or brown in the fall, they should be cut to the ground.
Cleaning peonies in the fall helps remove foliar diseases and reduce infection next year. Simply cut all growth off at the soil level and discard. The best time to prune a tree peony is right after it blooms, but not in the fall like herbaceous or Itoh peonies. Peonies can be cut and deadheaded in the spring and summer and must be cut down in the fall to control disease.
In the fall and early, tree peonies should be mostly left alone. In the fall and early, it is essential to cut them back, even if remediation is too far gone too late in the season. Peonies are prone to powdery mildew infection and should be cut back at the beginning of fall as they are very prone to fungal infections. They will most certainly flower again and re-grow.
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