How to store for the winter=zone 6 Buffalo, NY

I have (3) large cannas in a planter container. Do I need to remove them (bulbs) from the container. Or can I just cut them back, and move container into my garage?
Submitted by BHGPhotoContest

You can store cannas directly in pots over winter as long as the pots remain above freezing. If the garage falls below freezing, the canna rhizomes could be damaged. Their ideal storage temperature is approximately 50 degrees F.

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