Answer: Irises can and do grow in containers, but they perform best when planted in the ground. The reason for their preference is that iris rhizomes extend from both ends as they grow. Because of this growth habit they will soon outgrow their pots. You can keep them in containers for a year or two, but they should be dug and divided at the end of the second year. You can then repot them or plant them in the ground.
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