Answer: Mandevilla is a tender plant that is best grown outdoors in warm winter areas, and indoors in cold winter areas. (Roots are hardy only to about 5F degrees, which is much warmer than your winter weather!) Bring your Mandevilla indoors until springtime, give it bright light, a minimum of 55F degrees, water sparingly and mist the leaves occasionally. Growth will probably slow down while the plant is indoors and you can cut or pinch back the stems to keep the plant tidy. It will begin growing again in the early spring.
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