Answer: Mandevilla are frost tender tropicals and will suffer at temperatures below 50F. For best results they should be planted in pots rather than in the ground and the pots brought indoors by mid-October before the nighttime temperatures dip below 50. Place them in the brightest south or east-facing window in your house and take them back outdoors in the spring. Only time will tell whether or not your plants will come back. Cut the tops down to ground level and let's hope the roots survived their winter outdoors.
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