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response of collards to hard freeze

We just had a pretty hard freeze - unusual for this locale. Temps went down to 23F. I protected lots of stuff, but I ignored the collards, since they are reputed to be extraordinarily cold hardy down to much lower temperatures. After the freeze, they looked kind of wilted and drooping. I was surprised. But the leaves never died. I watered them, to the extent the freeze dried things out and, a four or five days later, they perked back up and look fine. What accounts for this behavior? I don't consider this behavior to be quite freeze intolerance. They didn't like it much. I have little experience with hard freezes, so others may know better.

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