Our native iris holds its own against the many iris cultivars with its graceful pale purple foliage and slender grey-green leaves. Irises thrive in irrigated gardens, and if you examine the natural habitat of our native iris you'll understand why. They grow primarilly in wet meadows that have plenty of spring moisture. They don't mind seasonal standing water and can tolerate a summer dry-down.
This plant will slowly spread via underground rhizomes, and can be divided when dormant (fall, early spring).
Plant them in a sunny irrigated spot (light partial shade is ok) with blue camas, indian hemp, showy milkweed, sneezeweed, streamside daisy, and sweetgrass, just make sure the don't get overrun by more vigorous, leafier neighbors.
Rocky Mountain iris