How to Prune Iris 'Dutch'?
Remove spent flower stems and any dying foliage in autumn

Iris 'Dutch' · Iris 'Dutch'
Grow in well-drained, fertile, neutral to slightly acid soil in full sun. Good for naturalising - choose a location where the soil will be hot and dry during the summer months. See bulb iris cultivation and bulbs: naturalising for further advice
Remove spent flower stems and any dying foliage in autumn