How to Prune iris 'Ruby Eruption'?
Cut down old flower stems after flowering, and remove any dying foliage in autumn

iris 'Ruby Eruption' · Iris 'Ruby Eruption'
Plant in full sun in well-drained soil, and with the top surfaces of the rhizomes exposed so that they get baked in summer sun, which encourages flowering
Cut down old flower stems after flowering, and remove any dying foliage in autumn