Hardy azaleas last through the winter, even in places where temperatures drop below freezing. Most hardy azaleas feature woody branches and dark, sturdy leaves, indicating a bit more ruggedness than tropical azaleas. Breeders across the northern United States rely on a few genetic lines to support cold-hardy azaleas. One classic set of hardy azaleas is the "Lights" series, such as Northern Lights, Western Lights, and Mandarin Lights. These azaleas were bred in Minnesota to withstand harsh winters, and even stand up to winds. However, a variety of hardy azaleas is now available on the market. These aren't your grandmother's plants-they'll stand up to freezing temperatures and come back year after year to provide beautiful flowers and outstanding performance.