How to Propagate iris 'Braithwaite'?
Propagate by division of rhizomes from midsummer to early autumn; see dividing irises

iris 'Braithwaite' · Iris 'Braithwaite'
Grow in well-drained, fertile, neutral to slightly alkaline loam in full sun. Will tolerate a slightly acidic soil. See also bearded iris cultivation
Propagate by division of rhizomes from midsummer to early autumn; see dividing irises