How to Prune wild peony?
Remove dead flowers as they fade, then cut back plant as the foliage dies down in autumn

wild peony · Paeonia mascula
Also known as: coral peony; English peony
Best in a deep, fertile, humus-rich soil that is moist but well-drained in a sheltered position in full sun or partial shade. Long-lived but resents disturbance. See herbaceous peony cultivation for further information.
Remove dead flowers as they fade, then cut back plant as the foliage dies down in autumn