Dipladenia is a tropical plant, hardy only to zone9 - that is, it can take a few days of freezing to slightly below freezing, but in general it should not be kept below 40 F (4.5 C). This article has more information on dipladenia: https://www.gardeningknowhow.com/ornamental/vines/mandevilla/growing-a-dipladenia.htm
Answered on September 9, 2014
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