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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.
Iris bloom profusely in early summer. Overview. Transplanting iris bulbs not only increases the size of your iris bed, it revitalizes old iris plants as well. After several years of growing in the same location, rhizomes multiply and roots begin to crowd, reducing bloom size and producing pale blooms.