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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.
Answer by thewindrose (642) Only prune back the flower stem after it has bloomed. You do not want to cut back iris leaves, or they may not bloom next year. To thin plants, dig up the rhizome instead. It will be very close to the top of the soil. Then you can transplant them or give them away!