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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.
Rating Newest Oldest. Best Answer: You should cut them back right after they finish blooming. Onlt cut back the stem that the flowers were on, unless you have any tattered or dead leaves ... Source(s): In general, iris rhizomes can be planted or moved at any time the ground can be dug.Digging within a month to six weeks of bloom time is likely to adversely affect the bloom but the plant will do fine.nce an iris is done blooming, it's a good idea to cut it back to within a few inches of the bulb. That's the green spiky part and the stem that held the flower both! I live in the north, and do mine in the fall, not spring.