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- Siberian irises bloom with showy flowers during spring. These irises are resistant to deer and non-invasive. Plants are reputed for their graceful appearance and tall stems as well as their low-maintenance requirements. Plants are hardy in USDA zones 4 through 9, characterized by average annual minimum temperatures of -30 to 25 degrees Fahrenheit. Flowers bloom from the middle of the spring through early summer with vibrant colors, including red, pink, white, blue, violet, orange and yellow. Flowers may be one solid color or multicolored. Plants grow to heights of 2-1/2 to 3 feet depending on the variety.
- Siberian iris can tolerate and adapt to a variety of soil conditions, even damp or wet soil. These flowering perennials grow from fibrous roots instead of rhizomes and can tolerate partial shade. Maximum blooming is attained when Siberian iris is planted in a location with full sunlight. Divide plants in spring or summer, at least once every three to four years. The optimal planting time is toward the end of September. Plant new Siberian iris plants anytime prior to Labor Day.
- Select a planting location with average moisture content. Prepare the area by tilling the soil and working in 2 to 4 inches of compost to enrich the nutrient content. Soak the roots of the plant overnight before planting. Dig a hole that is 3 to 5 inches deep and place the plant in the hole. Fill the hole in with the soil mixture, tamping it firmly around the plant. Plant irises 12 to 15 inches apart and add a 2- to 4-inch layer of mulch. Water thoroughly, soaking the planting area. Plants are also suitable for planting in large containers for use in a container garden.
- Although Siberian irises have not been hybridized extensively, several varieties exist and offer gardeners a wide range of colors. Mabel Coday is characterized by ruffled petals in a medium-shade of blue. Eric the Red Siberian irises are a deep burgundy color, while Helen Astor varieties bloom in a vibrant shade of mauve. Add deep purple hues to the landscape with Caesar's Brother, or use Snow Queen varieties for their crisp, white petals. Tealwood blooms with flared petals with a velvety purple hue, while Lady Vanessa blooms with violet-red petals. Plant at least three of each variety for maximum visual effect.
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