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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.
Instead, try to get them in the ground within a week.) You'll probably get about four days of bloom from each plant, but, in the garden, the irises seem to stagger their blossoms somehow. You'll typically have color for several weeks. After the blooms are gone, cut the stalks off, right next to the rhizome.