Answer: I think there's confusion on this topic because the different types of irises can have different "best" times to divide. I assume you are talking about bearded iris -- these can be moved any time during the growing season as long as you don't mind risking the blooms. Traditionally, these iris are moved about a month after they bloom but early spring is an okay time to move them, as is summer or even early fall. I'd go ahead and plant them now.
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