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

iris 'Princess Bride' · Iris 'Princess Bride'
Grows best in well-drained, fertile soil in full sun. For maximum flower set, bearded iris rhizomes need to be warmed by the sun. Plant with the rhizome just above the soil to maximise exposure to the sun and make sure that there is not too much competition from surrounding plants
Remove any dying foliage in autumn, old flower stems can be cut down after flowering