Planting instructions: Plant Bearded Iris in well-drained soil, in a sunny location about 5" apart, with the bottom of the rhizome about 2" deep: the top should be just covered with soil. Water thoroughly after planting. The best time to plant bearded iris is in the early fall. This will allow them to become well established before winter. Container-grown iris can be planted in the spring.
Care and Maintenance: Before flowering, water plants often enough to keep the soil moist but not wet. Reblooming iris should be watered during the summer, while spring-flowering iris will tolerate drought. After flowers fade, cut flower stalks back to an inch or two above the rhizome to prevent seed formation. Fertilization of iris is important to obtain best results, but must be done in moderation. Plants that are growing well (good green foliage) may not need fertilizing. If you fertilize, apply 1/2 cup of 5-10-10 fertilizer per iris clump after flowering. Fertilizer can burn the rhizomes; it should be applied around but not directly on them. Reblooming iris should be fertilized in the spring as new growth begins and after spring flowering ends. Iris respond to shallow (1 to 2 inches) cultivation and should not be mulched. In early fall, cut leaves 6 to 8 inches from the ground, especially if foliage disease occur.
After 3 to 5 years, iris generally become crowded and should be divided. Iris can be divided any time, but many growers prefer to divide 4 to 6 weeks after the flowering period. Cut the leaves to one-third their length. Dig the clump and wash soil off with a hose. Cut rhizomes apart so that each section has at least one healthy fan of leaves and firm, white roots. Older rhizomes may seem firm but should be discarded since they have limited flowering capacity.