These unthirsty succulents, flowers, and grasses will thrive with little care — even on a roof
Photo by Thomas J. Story
Purple-blue flower spikes rise above aromatic gray-green foliage in early summer. This sage, from Southern California and northern Baja, grows 3 to 5 feet tall, and 5 to 8 feet wide. Zones 8, 9, and 12–24.