Maintains a botanical garden with varieties of plants that conserve water. Tour also includes information on water-saving irrigation systems, mulches, and other xeriscape ideas. Group tours are available by appointment only. Honolulu Board of Water Supply and Friends of Halawa Xeriscape Garden offer educational workshops that feature xeriscape plants and gardening techniques that will help to conserve water outdoors. For xeriscape gardening classes/workshops: [email protected]