How to Prune Astrantia major subsp. biebersteinii?
No pruning required, but deadhead to encourage repeat flowering and, if seedlings are not wanted, deadhead before seed is ripe

Astrantia major subsp. biebersteinii · Astrantia major subsp. biebersteinii
Best grown in moist, fertile, preferably humus-rich soil in sun or part shade; drier conditions tolerated
No pruning required, but deadhead to encourage repeat flowering and, if seedlings are not wanted, deadhead before seed is ripe