You will want to get as much of the root ball as possible. So get large pots with drainage holes. Wait as long as you can before digging them out. Hopefully we will get some cold weather and frosts before you have to do so. It would be better if they were getting the message to take their winters nap before being dug out. Here are some article links on this subject for you to check out:
Answered on September 26, 2015
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