How to Propagate Japanese water iris 'Rowden Caesar'?
Propagate by dividing iris rhizomes from midsummer to early autumn

Japanese water iris 'Rowden Caesar' · Iris ensata 'Rowden Caesar'
Grow in moist to wet, deep, humus-rich, neutral to acid soil in sun or part shade; it thrives at the margins of ponds or streams
Propagate by dividing iris rhizomes from midsummer to early autumn