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Old December 4, 2016   #4
Join Date: Feb 2013
Location: Brantford, ON, Canada
Posts: 1,341

My lowest temperature is minus 20C some nights. I use a heat mat and sometimes cover the plants with a cloth. Fortunately the typical low temperature is usually around 0 to minus 8. I consider minus 20 a critical temperature calling for careful action to protect the plants.

I use those body heating pads with control being buttons low med and high from a pharmacy, since they are much cheaper than the typical heat mat, which needs an adjustable transformer for control.
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