How do you overwinter a mandevilla?

Mandevilla is a evergreen climber native to Brazil. Unless you have a greenhouse, overwinter mandevilla in a semidormant state with reduced light and cooler temperatures as found in a normal basement. Water sparingly, because semidormant plants will rot if kept too wet. Under these conditions all foliage will be lost. As spring approaches, prune the plant and slowly resume normal watering. When new growth begins, move the plant into a high-light site. Move it outdoors about May 15.