University of Wisconsin-Madison | Botany Plant Growth Facilities

Botanical Garden

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Genus: Iris Species: versicolor Common Name: Blue Flag Family: Iridaceae Order: Asparagales Native: North America Habit: Rhizomatous Herbaceous Perennial Height: 2 to 3 feet Width: 1.5 to 2.5 feet Flowering Season: Spring to Summer Flower Color: Blue Propagation: Seed or division Zone: 2-8 Note: Blue Flag is suitable for water gardens and bogs. This showy, native aquatic plant is very easy to grow. The rhizomes are extremely poisonous. Prefers sunny, fairly wet, sandy-loam, slightly acidic, moderately organic-rich garden soil.