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"Hardiness is the capacity of a cultivated plant to withstand adverse conditions, usually its tolerance of low temperature. Plants are given a hardiness rating by the U.S. Department of Agriculture in 11 zones based on the coldest or warmest temperature in that zone. The southern part of Minnesota is in zone 4 and the northern part is in zone 3."
<https://www.gertens.com//northern-exposure-purple-coral-bells>