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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.
Trim out any dead or badly damaged leaves. Cut these back to the base of the iris or trim off dead leaf tips if most of the leaf is still green. Prune back the entire iris plant to within 6 inches of the ground after the foliage begins to yellow in fall. Remove the old foliage from the bed and dispose of or compost it.