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Concern always arises in cold periods over winter about the effect of the low temperatures on alfalfa winter survival. This is of some concern because certainly the alfalfa plant will die if exposed to cold enough temperatures.
However, generally, alfalfa survives the winter and its periodic cold spells. The reasons are:
1.) Alfalfa can survive temperatures of -10 to -15°F.
2.) This is the temperature of the crown, not the top growth.
3.) As little as four inches of loose snow will insulate against up to 16°F of air temperature.
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