Dividing & Transplanting Irises: Timing & Technique

Irises divide best 6–8 weeks after blooming (usually July–September). This lets roots establish before winter.

Steps

1. Dig clump, shake off soil.
2. Cut rhizomes into 3–4 inch sections with fan of leaves and healthy roots.
3. Trim leaves to 6 inches.
4. Plant shallow: rhizome barely covered, roots spread down.
5. Water well; mulch lightly.

Local Nuances

Check with your county extension or nursery for exact timing in your zone. Frost dates matter.