Bearded iris rhizomes are simple to plant, but they have one rule: don't bury them too deep. Get that right and Cat's Eye will bloom for years.
Planting
- Unbox right away. Remove the rhizome from packaging and let it sit in a cool, dry, shaded spot until you can plant. Firm rhizomes with a few roots are exactly what you want.
- Pick a sunny, well-drained spot. Full sun to part shade with at least six hours of light gives the best bloom count. Avoid low areas where water sits.
- Loosen the soil. Dig 8-10 in. deep and mix in compost or coarse sand if your soil is heavy clay. Good drainage prevents rhizome rot.
- Set the rhizome shallow. Build a small mound of soil, drape the roots down both sides, and backfill so the top of the rhizome is just visible at the soil surface (about 1 in. deep in hot climates).
- Space 24 in. apart. Point the fan of leaves in the direction you want new growth to spread.
- Water in well. Soak once after planting to settle the soil around the roots.
Container Planting
- Use a wide pot. A 10-12 in. container with drainage holes suits one to three rhizomes.
- Choose gritty mix. A well-draining potting mix amended with sand or perlite keeps rhizomes from staying wet.
- Overwinter in place. In zones 4-6, move pots against a sheltered wall or sink them in the ground for the winter.
Watering
- Water sparingly. About 1 in. per week during the first season, then only during extended dry spells.
- Let soil dry between waterings. Established irises tolerate drought far better than soggy soil.
Feeding
- Feed in early spring. Apply a low-nitrogen fertilizer such as 5-10-10 around the clump as growth begins.
- Repeat after bloom. A light second feeding in early summer supports next year's flower buds.
- Skip heavy mulch. Mulch piled over rhizomes traps moisture and encourages rot.
Pruning & Dividing
- Snap off spent stalks. Cut flower stems to the base once blooming finishes.
- Trim foliage in fall. Cut leaves back to about 6 in. after frost and clear away debris.
- Divide every 3-4 years. In late summer, lift crowded clumps, cut healthy rhizomes apart, and replant to keep bloom production strong.