To propagate Siberian irises, you can divide them into sections and replant them. You can divide them in early spring or late summer.
When to divide
- Early spring: Divide when new growth appears
- Late summer: Divide in August after the plant has bloomed
How to divide
- Dig up the entire clump with a shovel or spade
- Remove dead roots and foliage
- Cut the clump into sections with a sharp knife
- Each section should have a good root system and several growing points
- Replant the divisions immediately
How to replant
- Plant the divisions at the same level they were growing
- Cover the rhizomes with 1–2 inches of soil
- Water regularly for the first 6–8 weeks
Why divide
Dividing Siberian irises ensures continued bloom. You can also share the divisions with friends and neighbors.