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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.
Caring for a Growing Iris. 1  1. Water generously after planting. After you plant your irises, give them a thorough watering. 2  2. Taper watering off as the plant becomes established. Over time, your plant will require less and less watering on your part. 3  3. Keep rhizomes uncovered and roots well-aerated.