8 Drought-Tolerant Plants a Pro Landscaper Swears By

"I’ve seen many a pine tree survive on a roof with very little water," says Freda. "My favorite types of pines are Mugo and Japanese Black Pine." When considering pine trees, make sure your space allows for their full size. Some pine trees can grow up to 80 feet or more (given the right conditions), so smaller varieties like Freda's favorites are best for smaller spaces.