How to plant reblooming bearded iris rhizomes?

 

Planting reblooming irises is similar to planting regular irises, with a few considerations to ensure they have the best chance of reblooming. Here's a step-by-step guide on how to plant reblooming irises:

1. Timing: Reblooming irises can be planted in either spring or late summer/early fall. Spring planting allows the plants to establish before summer, while fall planting gives them a head start on root development before winter.

2. Soil and location: Choose a planting location that receives at least 6 hours of direct sunlight per day. The soil should be well-draining and moderately fertile. If the soil is heavy or compacted, you can improve drainage by adding organic matter such as compost or well-rotted manure.

3. Digging the hole: Dig a hole that is wide and deep enough to accommodate the iris rhizome. Make the hole wide enough to spread out the roots comfortably. The top of the rhizome should be level with the soil surface or slightly exposed.

4. Planting the rhizome: Place the rhizome in the hole, ensuring that the fan of leaves is facing outward. Spread out the roots in the hole and gently backfill with soil, firming it around the rhizome. Avoid planting the rhizome too deeply, as this can inhibit reblooming.

5. Spacing: Space reblooming irises approximately 12-18 inches (30-45 cm) apart to allow for their spreading growth habit and to avoid overcrowding.

6. Watering: After planting, water the rhizome thoroughly to settle the soil and ensure good root-to-soil contact. Keep the soil evenly moist but not waterlogged during the establishment period. Once established, reblooming irises are generally drought-tolerant and can tolerate some dryness between waterings.

7. Mulching: Apply a layer of organic mulch, such as straw or wood chips, around the base of the plants. Mulching helps retain soil moisture, suppress weed growth, and regulate soil temperature. Leave a gap between the mulch and the rhizome to prevent moisture buildup and potential rot.

8. Care and maintenance: Reblooming irises require regular care and maintenance. Keep the plants well-watered during dry spells, especially in the first year after planting. Fertilize the irises in early spring with a balanced, slow-release fertilizer or a specific iris fertilizer. Remove any dead or yellowed foliage and trim back the leaves in late fall or early spring.

9. Winter protection: In areas with cold winters, provide winter protection for reblooming irises by applying a layer of mulch over the rhizomes after the ground freezes. This helps insulate the rhizomes and protect them from temperature fluctuations.

10. Monitoring and division: Monitor the irises for any signs of pests or diseases and take appropriate measures if needed. Reblooming irises may benefit from division every few years to prevent overcrowding and promote healthier blooms. Divide the rhizomes in late summer or early fall, ensuring each division has a healthy fan of leaves and roots.

By following these planting and care guidelines, you can help your reblooming irises establish and thrive, providing you with multiple rounds of beautiful blooms throughout the growing season.