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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.
Perennials that bloom in the spring-astilbe, peonies, bearded iris, bleeding heart and others-can easily be divided and moved in late summer or fall. Those that have begun to show signs of entering dormancy-browning foliage-can also be moved in early fall.