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Dividing irises and day lillies

My irises and day lilies have not been divided in many years. When is the very best time this fall to perform this task? And I would appreciate any tips for this project, as I have never done this before. Thank you!
Submitted by BHGPhotoContest

Mid-September is a great time to divide daylilies and irises, so get out there this weekend! For details on how to divide, check out our story on dividing perennials at

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As of 10/30/2012, link still does not work :-(
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