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

peony 'Flame' · Paeonia 'Flame'
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 plant back as the foliage dies down in autumn