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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.
Watch as your iris plants bloom beautifully in late spring to early summer. Some gardeners enjoy cutting the blooms and using them in floral arrangements. Cut some blooms off with long stems if you wish to use them in an arrangement.