If you can move the containers to an garage or any other such enclosed structure that would help. Even if unheated such a location will usually be much warmer that outdoors areas. Grouping plants together and covering the containers also helps prevent cold damage. Tightly bunch a group of containers together up against the outside of your home, in an area protected from the wind if possible. You can heap up leaves around them for an added blanket of protection if feasible. Then cover the grouping with a tarp to deflect wind and hold in the heat of the earth. This technique provides considerable protection compared to containers left out in the open.
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