Siberian Iris is one of those plants that rewards patience and rewards it generously. Native to the meadows and streamsides of Central and Eastern Europe, it forms steadily expanding clumps of narrow, blue-green strappy foliage that stay attractive long after the flowers have gone. Those flowers — typically shades of rich bluish-purple, though cultivars span white, pink, orange, red, and yellow — appear in spring in generous clusters, with a single established plant capable of producing 12 to 20 blooms. The name iris translates to the Greek goddess of the rainbow, and the flower's distinctive silhouette gave France its fleur-de-lis. Both honors feel earned.

Grow it in full sun with evenly moist, slightly acidic, organically rich soil and it asks little in return. A position near a pond edge or along a stream suits it perfectly, though well-established plants will tolerate a dry spell with dignity. In the southeast, some afternoon shade keeps it from overreaching. Divide every three years or so, once flowering begins to thin — the rhizomes spread from the center outward and older growth at the middle becomes spent over time. When dividing, loosen the soil carefully, cut back foliage to six or eight inches, and ensure each section carries at least two fans of growth. Plant in fall across most regions, allowing the cold winter ahead to prime the rhizomes for a generous spring bloom.