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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.
Iris plants are dependable perennials that will bloom year after year to add beauty and color to any sunny flower garden. With minimal care, irises will return each spring with long thin leaves and tall stems sporting colorful blossoms. After the irises finish blooming for the summer, cut the blooms from the plants.