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The Garden Professors blog has two interesting and related posts describing how cold-hardy plants can survive temperatures well below freezing. If you are a gardener or farmer, you might be interested in reading about this. The two posts are listed below:

Part 1: The mechanics of how plants survive cold temperatures

https://gardenprofessors.com/a-gardeners-primer-to-cold-hardiness-part-1/

Part 2: How you can use this knowledge to help your plants through cold snaps

https://gardenprofessors.com/a-gardeners-primer-to-cold-hardiness-part-2/

Source: Commons Wikimedia