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Iris x robusta is a designation for hybrids of two native American irises (Iris versicolor x Iris virginica). This hybrid forms a clump of narrow, arching-to-erect, sword-shaped, green leaves. Leaves have a flush of purple in spring that fades by summer. Leaves are also spotted with purple-red at the base. Purplish-black flowering stalks rise from the clump to 36” tall in late spring, typically producing 2-3 violet-blue flowers per stalk. Clumps spread slowly by tough, creeping rhizomes. The rhizomes of this plant are poisonous.
- Type: Perennial
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Zone: 4 to 9
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Height: 2-3 feet
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Spread: 1.5-2.5 feet
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Bloom Time: May to June
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Bloom Description: Violet blue
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Sun: Full sun to part shade
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Water: Medium to wet
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Maintenance: Low
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Suggested Use: Water Plant, Naturalize
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Flower: Showy
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Leaf: Colorful
- Tolerate: Deer