Treat mandevilla vines as annuals
in northerly climes. Alternatively, plant mandevilla vines in containers (as in picture above), so that they can be brought inside before the frost. Prune them back so that only about 6" of growth remains, and store them in a cool nook in your cellar (about 55 degrees). Water your mandevilla vines very sparingly during this period. Return the mandevilla vines to your yard when good weather returns.