Coleus are damaged by temperatures under 50F. This is why they are considered annual plants anywhere north of the tropics. You can cover them, but because they are so inexpensive and plentiful, most people consider freeze protection for them just too much trouble. This article has more information: https://www.gardeningknowhow.com/ornamental/foliage/coleus/coleus-plant-care.htm
Answered on November 19, 2014
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