Answer: The best time to divide Butterfly iris is in the fall. This gives the plants all winter to establish their roots so they are prepared to produce new foliage and flower stems the following spring. There's nothing you can do at this time to hurry your plants up - they'll just need to become re-established before they're capable of developing additional leaves. You can help matters along by keeping the soil moist (but not soggy wet) and just being patient with them. As soon as the roots are established they will produce lots of new foliage.
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