Siberian Flag

Iris sibirica (Iridaceae) is a clumping, rhizomatous perennial native from Europe to central Asia, possessing the widest distribution of the Siberian iris series. It grows rapidly to 2 to 4 feet tall with a 2- to 3-foot spread, producing soft, grass-like foliage that turns brown to copper in autumn. The beardless flowers consist of three upright standards and three lower falls, available in white, yellow, blue, wine, and purple, typically marked with white or gold flashes on the falls.

Siberian iris thrives in sun to part shade and performs well in moist to wet soils with a pH of 6.0 to 8.0. It is especially effective planted near streams and ponds but tolerates some drought once established. Maintenance requirements are low, and pest and disease pressure is minimal, with slugs and snails being the primary concern. The flowers attract bees, butterflies, and other pollinators. Plants are hardy from Zones 3a to 8b and tolerate temperatures to minus 20 degrees C. All parts have low toxicity, concentrated in roots and rhizomes.