Elevate Your Garden with Dutch Iris Bulbs (Iris Hollandica)
With their uniquely delicate style and striking color palettes, Dutch Iris are among the most popular late-spring perennial plants in the garden. Flower lovers adore the lovely upright form and charming dropped falls, and garden pros love the range of colors available and carefree growth habits exhibited by these gorgeous cultivars. Perfect for sun-filled borders or beds, Dutch Iris are sure to win over your customers for years to come as these naturalizing flowers reliably return annually.
Planting Dutch Iris Bulbs
Dutch irises reach about 24 inches tall, bloom from May to June, and thrive in USDA hardiness zones 4–9.
- When To Plant—Plant Dutch iris bulbs in fall for the best display the following spring. In colder zones, late fall is ideal; in milder climates, early winter works. Spring planting is possible but may delay the first bloom season.
- Where To Plant—Choose a site with well-drained, moderately fertile soil. Dutch irises tolerate light shade but produce the most flowers in full sun.
- How To Plant—Set bulbs in fall 4 inches deep and space them 3–6 inches apart. For a bold display, group several bulbs together rather than scattering them singly.
- How To Care for Dutch Iris—Allow plants to establish into clumps over 3–5 years. As clumps thicken, flowering may decline, signaling it’s time to lift and divide the bulbs.
- When To Transplant Dutch Iris—Transplant during dormancy, typically in fall, after the foliage has withered.
- How To Divide Dutch Iris—In fall, once leaves have died back, lift the clumps carefully. Select firm, healthy bulbs, separate them, and replant at the proper depth and spacing. Discard any soft, diseased, or damaged bulbs.
- What To Do with Dutch Iris After They Bloom—After flowering, leave the foliage in place until it yellows naturally. The leaves feed the bulbs, supporting strong blooms the following year.
For more information on planting and growing Dutch Iris bulbs, check out our in-depth guide to Irises: How To Plant, Grow and Care For Irises