- When iris have finished blooming, remove spent bloom stalks.
- Dig up and divide the rhizomes.
- Choose healthy, vigorous rhizomes to be replanted. These will have strong roots, a well-developed fan, and be free of borer holes. Discard small, unhealthy rhizomes in the trash. Also discard those which have already bloomed.
- Trim roots to about 6″ and trim fan. Trimmed roots are easier to replant. Shorter fans won’t blow over in the wind.
- Dig hole wide enough to accommodate the root and about 3-4″ deep. Make a platform for the rhizome so it can sit with its top at or just below soil level and the roots can spread and anchor around it.
- Cover the roots with soil and firm it, making sure the top of the rhizhome is at or just below the soil’s surface.
- Place rhizomes 15-24″ apart.