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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.
Unlike many other perennials, iris rarely require a serious trimming. Pruning back the leaves before transplanting is a necessity to avoid damaging them. Minor trimming, especially before the winter months, also improves the look of the plant and helps prevent diseases from affecting your iris plants.