They are available in shades of blue, purple, wine-red, pink, white, and yellow. Siberian irises bloom in late May or June. The foliage of Siberian irises is narrow, upright, and grass-like in appearance. The green foliage often turns to an attractive yellow or orange-brown in the fall. Varieties range in height from 12 to 40 inches.
Siberian irises perform best in moist, well-drained, fertile soils.
They do well in partial shade to full sun. Unlike bearded irises, Siberian irises don't have serious insect or disease problems. Siberian irises are seldom bothered by the iris borer, soft rot, and leaf spot. Also, plants don't require frequent division. The flower consists of 3 very large, nearly horizontal falls and 3 short, spreading standards.