Siberian iris is an herbaceous perennial native to the colder regions of Europe and Asia. The plant typically reaches about 3 feet in height and 1 1/2 feet in diameter. Siberian iris forms ornamental flowers during late spring and early summer in a wide variety of colors including red, yellow, orange, white, violet, blue and pink. Siberian iris plants are commonly used in bouquets and flower arrangements, due to the long life of their flowers after being cut. Siberian iris requires only basic care to grow and flower year after year in the home garden.
Plant Siberian iris any time the soil is workable in a location that receives 6-8 hours of direct sunlight each day. Spread 2 inches of manure over the planting site and use a garden hoe to incorporate it into the soil to increase drainage and fertility.
Use a shovel to dig a hole of equal depth and twice as wide as the Siberian iris root ball. Place the root ball directly into the hole and cover with soil. Water thoroughly to compact the soil around the roots. Space Siberian iris plants 2 feet apart.
Spread a 2-inch layer of mulch over the soil surrounding Siberian iris to reduce competitive weeds and increase moisture retention. Begin the layer at least 3 inches from the base of the plant to allow room for growth and proper air circulation.
Water Siberian iris once per week during the spring, summer and fall, except on weeks that receive at least 2 inches of rain. Apply water directly to the soil to prevent splashing on the foliage, which will increase the chance of disease. Do not water during winter.
Feed Siberian iris plants once per year during early spring, just before new growth begins. Use a balanced 10-10-10 NPK fertilizer to provide the proper nutrients for flowering. Apply following the manufacturer's directions for proper dosage.
Remove dead or faded Siberian iris flowers as quickly as possible to encourage the formation of additional blossoms. Allow one or two flowers to remain on the plant and turn into ornamental seed heads to increase aesthetic appeal if desired.