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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.
Irises may not bloom for several reasons. * Too much nitrogen-cut down on the nitrogen element in any fertilizer that you might be using. * not enough nutrients or water (but be sure not to overwater, though, which can encourage rot). * not enough sun-they should get at least 6 to 8 hours of full sun each day.lso, iris stop blooming when they are crowded and need to be divided every 3 to 5 years. Divide and replant in July, August or September when they are sleepy due to the heat. When you replant, ensure that the iris plants have good drainage. Water can not stand in the beds.