On a cliff overlooking the town of Bathsheba on the rugged east coast, limestone boulders make for a natural 3-hectare (7 1/2-acre) rock-garden setting. Thousands of orchids, hundreds of hibiscus and heliconia, and many varieties of ferns, begonias, palms, and other species grow here in splendid profusion. You'll occasionally see toads, frogs, herons, lizards, hummingbirds, and sometimes a mongoose or a monkey.