How to Propagate iris 'Gerald Darby'?
Propagate by division of rhizomes from midsummer to early autumn

iris 'Gerald Darby' · Iris × robusta 'Gerald Darby'
Grow in moist to wet, deep, humus-rich, acid soil; thrives at the margins of ponds or streams
Propagate by division of rhizomes from midsummer to early autumn