How to Propagate iris 'Ruby Eruption'?
Propagate by division of rhizomes after flowering, from midsummer to late summer; for more advice, see dividing irises

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
Propagate by division of rhizomes after flowering, from midsummer to late summer; for more advice, see dividing irises