The ideal time for division is every three to five years between late summer and early fall (July to September). This ...

Though they're not too fussy about soil, all irises benefit from dividing every three or five years. The best time to divide ...

Replant irises in groups about 30cm (1ft) apart, with the rhizome just below the surface. Firm soil around roots and water well.

Water the newly planted iris plants lightly every day for at least ... and fertilizing newly planted perennials is not advisable. Divide and replant your Japanese iris in the fall every three ...