How to Propagate Delavay iris?
Propagate by seed sown in autumn or by division in early autumn

Delavay iris · Iris delavayi
Grow in any good garden soil that is preferably moist but not waterlogged. In drier soils, dig in well-rotted organic matter before planting then apply as a mulch each spring
Propagate by seed sown in autumn or by division in early autumn