How to Prune Iris 'White Excelsior'?
Cut back old flower stems after flowering and remove dying foliage in autumn. Lift and separate bulbs in 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
Cut back old flower stems after flowering and remove dying foliage in autumn. Lift and separate bulbs in autumn