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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.
How Soon After Irises Stop Blooming Can the Greenery Be Cut Back? Known for their signature three falling petals, irises (Iris spp.) grow between 4 and 36 inches tall, depending on the variety. These perennials commonly blossom in the spring and summer with colors ranging from orange to purple.