How to Propagate iris 'Black Sergeant'?
Propagate by division of rhizomes from midsummer to early autumn, see dividing irises

iris 'Black Sergeant' · Iris 'Black Sergeant'
Grow in well-drained, fertile, neutral to slightly acid loam in full sun. See bearded iris cultivation
Propagate by division of rhizomes from midsummer to early autumn, see dividing irises