
I found a couple of sites that gave quite detailed information on when and how to transplant Irises and so I have included the links bellow. There is also a quick informative YouTube video that I found which was produced by the Central Piedmont Community College (CPCC) in North Carolina (US).
The consensus seemed to be to wait for a few weeks after bloom!
GardenWeb site: How do I dig, divide, and transplant bearded irises?
Gardening Know How site: Dividing and Moving Iris – How To Transplant Iris
https://www.youtube.com/watch?v=KWlvKq3bSh8&feature=related
CPCC YouTube video: Horticulture Tip, Iris Dividing



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