Iris sibirica hybrids, commonly named, Siberian Iris are species from central Europe and Russia. They grow up to 4 feet tall but most are around 2 feet tall. Iris sibirica multiplies rapidly and is one of the easiest of all perennials to grow. The flowers are consisting of 3 sepals and 3 petals. There are dozens of cultivars, in a varied range of splendid blue-purple, lavender, or white flowers, including some of the most striking and elegant of all iris. As long as their moisture requirements are met, they will bloom in a wide range of conditions. They are tough, reliable plants and generally free of pests and diseases. They bloom profusely for two or three weeks in May. A single clump of Siberian Iris will produce 12-20 flowers once established. Foliage is narrow and sword-like with a slightly arching habit of growth. It stays bright green and remains attractive all Summer. They are deciduous in Winter and need to be cut back once a year in Winter after the foliage has turned brown. The plant spreads by means of its modified stems, rhizomes, which are located below the soil surface. Hardiness zones 3-9, (-37øC/-35øF, -5øC/25øF) in Winter. Siberian Iris likes full sun or very light shade, especially in hot areas. It likes rich, acid soil with regular watering. Requires consistently moist soil; do not let dry out between waterings. It will tolerate less than ideal conditions, and is surprisingly drought tolerant.