You don't have to but keep in mind that if you do not bring them indoors in your region, the plant will likely not return. For this reason, these plants are normally treated as annuals when planted outdoors where winters drop below 50 degrees F. That said, if you don't mind replacing your mandevilla each year, they can remain outside. Otherwise, I would recommend bringing the plant inside over winter.
Answered on September 18, 2015
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