How to Propagate iris 'Deep Black'?
Propagate by division of the rhizome shortly from mid-summer to early autumn. See dividing irises

iris 'Deep Black' · Iris 'Deep Black'
Plant rhizomes just above soil level. Thrives in a sunny position, in ideally neutral soil with good drainage. See bearded iris cultivation
Propagate by division of the rhizome shortly from mid-summer to early autumn. See dividing irises