How to Propagate Iris 'White Excelsior'?
Propagate by offsets in late summer or early autumn

Iris 'White Excelsior' · Iris 'White Excelsior'
Grow in any moderately fertile, neutral to alkaline, well drained soil in full sun. Plant bulbs at twice their height in late summer or early autumn and feed with a high potash fertiliser after flowering. See bulb iris cultivation for more information
Propagate by offsets in late summer or early autumn