Answer: It sounds as though your iris are overcrowded and need to be divided. Iris like full sunshine and well-draining soil. Wait until late summer to dig and divide the clumps, and amend the soil with organic matter before replanting them. When you dig the rhizomes, cut or break off the ends and discard the center. Plant so the roots are spread out and the rhizomes are just at, or below the soil surface. Rhizomes grow outward from the end with the leaves, so point that end in the direction you want the growth to take. Space the rhizomes 1' - 2' feet apart when replanting.
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