Rain Garden Plants: Blue Flag Iris

Blue flag's swordlike leaves emerge from thick, horizontal rootstock (corm), which is covered with fibrous roots. Flowering stalks produce three to five showy flowers. Minor skin irritation can occur upon contact with seeds or cell sap. Attracts hummingbirds. Foliage is unpalatable to deer and other herbivores.

• Height: 24 to 30 inches
• Bloom color: Blue, purple
• Bloom time: May to June
• Hardiness zones: 4 to 9
• Salt tolerance: Moderate
• Spreading habit: Spreads by self-seeding and extension of rhizomes

Site Conditions

• Sun: Sun/partial shade
• Soil: Organic, acidic (pH < 6.8)
• Hydrologic zones: Wet/moist, 0 to 6 inches, can tolerate complete submergence

Source

Lady Bird Johnson Wildflower Center

Prepared by Jessica Chou, Jodi Sulpizio, and Constance Schmotzer.