Dutch Iris bulbs are planted in fall for blooms the following early summer. Open your package right away and store the bulbs in a cool, dry, dark spot until you are ready to plant.
Planting
- Pick your spot. Choose a site with full sun to partial shade and soil that drains well; standing water will rot the bulbs.
- Loosen the soil. Work the top 8-10 inches of soil until it is crumbly, mixing in compost if your ground is heavy clay.
- Set the depth. Plant bulbs 4-5 inches deep with the pointed end facing up.
- Space them out. Leave 3-6 inches between bulbs, and plant in clusters of 10 or more for the best color impact.
- Water in. Backfill, firm the soil gently, and water once to settle everything into place.
Watering
- Fall and spring. Keep the soil lightly moist while roots and shoots are growing, about an inch of water per week including rainfall.
- After bloom. Cut back on water as the foliage yellows; the bulbs prefer a drier rest period in summer.
Feeding
- At planting. Mix a balanced bulb fertilizer into the planting hole.
- Each spring. Feed once as shoots emerge to fuel strong stems and next year's flowers.
After Blooming
- Deadhead spent flowers. Snip off faded blooms so energy goes back to the bulb.
- Leave the foliage. Let the grass-like leaves die back naturally before removing them.
- Mulch in cold zones. Add 2-3 inches of mulch after the ground chills to protect bulbs through winter.
Containers
- Use a deep pot. Choose a container at least 10 inches deep with drainage holes and quality potting mix.
- Overwinter cold. Potted bulbs need a cold period; keep pots in an unheated garage or sheltered spot and water sparingly.