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Old May 22, 2019   #5
bower's Avatar
Join Date: Feb 2012
Location: Newfoundland, Canada
Posts: 6,761

28 F won't kill a typical hardneck garlic. There are some more sensitive types that might succomb, I suppose, if they're not mulched and the ground freezes down to where they're planted? Perhaps. Some garlic might get a yellow leaf or two if exposed to those temperatures repeatedly (after it's through the ground). It won't affect production though.
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