Behold the blooms of the Southern Blue Flag Iris, ranging from pale to deep purple, each with delicate veining and a bold yellow blaze. Curved petals make perfect landing pads for bumblebees, its main pollinator, and the easy-to-spot pattern attracts butterflies, too. This moisture-loving resilient native species is rain garden approved. Gorgeous blooms appear in late spring, crowning bright green clumping foliage that shoots outward from rhizomes and forms dense, impressive stands.