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