Common Name: blue flag
Type: Herbaceous perennial
Family: Iridaceae
Native Range: Northeastern North America
Zone: 3 to 9
Height: 2.00 to 2.50 feet
Spread: 2.00 to 2.50 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, Rain Garden
Flower: Showy
Tolerate: Deer, Wet Soil

Culture
Grow in medium to wet soils in full sun to part shade. This iris may be grown in up to 2-4” of shallow standing water (muddy bottom or containers), or in moist shoreline soils or in constantly moist humusy soils of a border. 

Noteworthy Characteristics
Iris veriscolor, commonly called northern blue flag, is a clump-forming iris that is native to marshes, swamps, wet meadows, ditches and shorelines from Manitoba to Nova Scotia south to Virginia, Ohio, Illinois and Minnesota. It is a marginal aquatic plant that forms a clump of narrow, arching-to-erect, sword-shaped, blue-green leaves (to 24” long and 1” wide). Flowering stalks rise from the clump to 30” tall in late spring, with each stalk producing 3-5 bluish-purple flowers (to 4" wide) with bold purple veining. Falls (sepals) have a central yellow blotch surrounded by a white zone. Clumps spread slowly by tough, creeping rhizomes. Northern blue flag thrives in wetland habitats frequented by rushes and sedges (the "flag" part of the common name comes from the middle English word flagge meaning rush or reed). Rhizome is poisonous.

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