After your peonies finish their spring bloom, the remaining cluster of seedpods can look untidy. While they don't affect future flowering—since peonies bloom only once per season—most gardeners remove them to maintain the plant's summer appearance.
Leave the foliage intact until it turns brown in November. At that point, you can cut common peonies back to the ground. However, if you have a tree peony, do not prune it to the ground; leave the brown structural twigs in place.
To avoid accidentally stepping on dormant peony clumps in winter, cut the tops off old plastic pots to create a 1-inch wide rim and place it around the plants. This makes them more visible and protects the crowns.

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