Thanks for writing. In your area, you'll need containers that are about 48 inches in diameter for most perennials to survive the winter. If your containers are smaller than that, you'll probably need to move them to a sheltered spot such as an unheated garage or storage shed for the winter.
When I lived in the Twin Cities and had an apartment, I grew several kinds of perennials in 24-inch-wide pots; I kept them in my garage for the winter and the plants did fine.
---Justin, Senior Garden Editor, BHG.com
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