Iris versicolor, Blue Flag

Blue flag
Iris versicolor

Hardiness: Zones 3 to 9
Plant type: Herbaceous perennial
Height: 2- 2.5'
Spread: 2- 2.5'
Sun: Full sun to part shade
Water: Medium to wet
Bloom time: May, June
Bloom color: Violet blue
Soil: Moist, organically rich soils, acid (<7pH).

Notes: Feeds both native bees and hummingbirds during the quiet time, between Virginia bluebells (Mertensia virginica) and bee-balm (Monarda sp.), in late spring.

More information on this plant here.