Blue Flag Iris has lovely, deep, bluish-purple blooms on this attractive iris with blue-green, sword-like foliage. Foliage stays nice all summer long on Blue Flag Iris and it adds a nice pop of color to your spring water garden, growing 24 - 30 inches tall. Blue Flag Iris blooms early or late spring, depending on zone. Blue Flag Iris is one of the most popular iris varieties!
Height Grows 24 - 30 inches tall
Width Grows 24 - 30 inches wide
Sunlight Requirements Full sun to part shade (Blooms better in full sun)
Moisture Requirements Moist Soil or shallow water
Bloom Blooms early or late spring, depending on zone
Fertilize Use compost in terrestrial gardens, fertilizer tabbs in the pond, once a month, June through August
Zone Hardy in zones 3 - 9
For terrestrial gardens, plant Blue Flag Iris in moist, loamy soil in full sun to part shade (6+ hours of sunlight). Dig holes twice as large as iris rhizomes, loosen soil and add compost before placing rhizome in soil with pointed ends up and roots down. Place rhizomes 1/2 inch beneath the surface of the soil. Great for naturalizing in moist, wetlands as well as bog areas of the pond. When placing Blue Flag Iris in the pond, use a wide container with holes, a planting basket or fabric planter using loam soil. Plant rhizomes with 1/2 inch of soil above the rhizome and place in the pond with 3 inches of water above the rhizomes, in full sun. Fertilize once a month with Waterlily World Fertilizer Tabs + Humates from June through August.
Cut foliage back to about one inch above the rhizome after the first frost in the fall.
Divide your Blue Flag Iris every couple of years.
Pondmegastore Tip It is important to wear gloves when planting or dividing Blue Flag Iris rhizomes as they are poisonous.