Revitalizing Overcrowded Iris Patches: Dividing, Replanting, and Post-Bloom Care

Dividing Iris for More Blooms

An iris patch that produces only one flower stalk each year is severely overcrowded. Iris rhizomes need division every 3–4 years.

Division Steps (Late Summer/Early Fall)

1. Dig up the entire clump with a fork.
2. Discard old, leafless, or mushy rhizomes.
3. Cut healthy rhizomes into sections, each with a fan of leaves and roots.
4. Trim leaves to 6–8 inches.
5. Replant 12–18 inches apart, barely covering the rhizome.
6. Water well.

Post-Bloom Care

• Cut flower stalks to the base after blooming to prevent seed formation.
• Leave foliage until it yellows in late summer/fall; it feeds the rhizome.
• Apply bone meal in early spring and again after bloom.

Replacing with Calla Lilies

If you prefer callas, simply dig out all iris rhizomes (give them away or compost) and plant calla rhizomes in their place. Callas need winter storage in cold zones.