The next sign that you should consider transplanting your iris is if the roots, or rhizomes start heaving out of the ground. Overcrowded iris rhizomes will start to push on each other, which results in the entire root system of your iris plants literally pushing themselves out of the ground. They may even stop putting up foliage and the plants may only grow foliage on the outside edges of the clump.
Best Time to Make the Move
The best time to transplant iris is in the summer, after the iris have finished blooming, up until fall. To divide your iris, start by lifting the clump of iris plants out of the ground with a spade or fork. If possible, lift the whole mass out whole, but if you are unable to do this, carefully break the clump into smaller parts and lift these out.
Next, brush of as much dirt as possible from the iris rhizomes. This will make it easier to see when you are breaking the clumps apart.
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