Question: I bought 2 red Mandevilla plants today from home depot-Uban Gardener UG-2018. No one seems sure if it is a perennial. Last year I planted one in the ground and it did not return this year. I live in the Philadelphia suburbs. Should I plant these in the ground or keep them in pots and bring them inside for the winter? I have an arbor that I want to let it attach to. Thanks, Cheryl
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