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

Himalayan peony · Paeonia emodi
Also known as: Mount Emodus 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. See herbaceous peony cultivation
Remove dead flowers as they fade, then cut plant back as the foliage dies down in autumn