Answer: Garden centers often sell plants that are not winter hardy in their zones with the thought that customers will enjoy them for the summer and then either winter them over indoors or in a greenhouse. It's a common practice; you'll probably find exotics such as banana and citrus trees, as well as Mandevilla in your local nursery. You're right, the lantana won't survive your winter weather outdoors. Pot it up and leave it outside for a few weeks to get over the shock of being transplanted, then gradually move it into a bright spot indoors. It may not flower inside, but it should survive. Keep it out of drafts and away from heat registers. Provide bright light or supplement natural light with a gro-lite or two. Water when the top inch of soil dries out and prune back any overly vigorous stems and branches. Take it back outside in the spring when the weather warms.
Best wishes with your lantana!
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