Answer: If the ground has frozen you may not be able to dig them up this late in the game. If that is the case, you could try heaping extra mulch over top of the area to try to insulate them a bit more than usual, and hope for the best. In my experience, though, odds are that they will not survive a normally cold Indiana winter.
Cannas can be dug and moved in the spring, too, so assuming they survive the winter it should be no special problem to transplant them next spring.
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