Lotusland, the celebrated garden created by Ganna Walska in Santa Barbara, California, represents the second half of the creative life of a woman, who was, in her time a femme fatale, much married, but with a steely ambition to become a famous opera diva, though her talent was slight. From Polish teenager in the early part of the 20th century, she became a pre-revolutionary baroness in Russia, with five subsequent husbands, including American industrial...