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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.
For Siberian iris, the right time for transplanting depends on where you garden. In colder regions, transplanting iris occurs in early spring, with late August offering a second option. For gardeners in warm regions, fall provides a good time for transplanting iris.