How to Prune marsh blue violet?
Deadhead to prolong flowering. After flowering cut back vigorous plants to keep compact

marsh blue violet · Viola cucullata
Also known as: fighting cocks; hollow-leaved violet; hookers; North American blue violet; roosters
Grow in fertile, humus-rich, moist but well-drained soil in full sun or partial shade
Deadhead to prolong flowering. After flowering cut back vigorous plants to keep compact