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The best time to move iris is six to eight weeks after they bloom. Division and transplanting can be done at the same time. I would try to flag them now with some type of marking system while in bloom so that you know what you are moving later.
Irises can remain in bloom for up to a month. The sword-shaped leaves and tall graceful flowers of an iris (Iris spp.) plant provide an anchor in garden beds and borders. These long-lived perennials grow in U.S. Department of Agriculture plant hardiness zones 4 through 11, depending on the specific variety.