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Iris x robusta 'Gerald Darby'
Iris x robusta 'Gerald Darby'
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Iris x robusta 'Gerald Darby'

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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
  • Zone: 4 to 9
  • Height: 2-3 feet
  • Spread: 1.5-2.5 feet
  • Bloom Time: May to June
  • Bloom Description: Violet blue
  • Sun: Full sun to part shade
  • Water: Medium to wet
  • Maintenance: Low
  • Suggested Use: Water Plant, Naturalize
  • Flower: Showy
  • Leaf: Colorful
  • Tolerate: Deer