How to Prune iris 'Allison Elizabeth'?
Remove any dying foliage in autumn, old flower stems can be cut down after flowering

iris 'Allison Elizabeth' · Iris 'Allison Elizabeth'
Grow in well-drained neutral to alkaline soil in full sun; acid soils are tolerated if well-drained
Remove any dying foliage in autumn, old flower stems can be cut down after flowering