How to Prune iris 'Dancer's Veil'?
Remove any dying foliage in autumn; old flower stems can be cut down after flowering

iris 'Dancer's Veil' · Iris 'Dancer's Veil'
Grow in well-drained, fertile, neutral to slightly acidic soil in full sun. Do not cover the rhizomes with mulch, or allow other plants to shade them. See also bearded iris cultivation
Remove any dying foliage in autumn; old flower stems can be cut down after flowering