Plants that can tolerate occasional mild frost grow in this four-acre hillside garden on the scarp of the Raymond Hill earthquake fault. The south-facing slope is one of the warmest areas of the gardens, providing a nurturing home for plants from areas of the world with mild climates and winter rainfall similar to Southern California’s and other subtropical climates with summer rainfall. Plantings are constantly changing in order to determine the ornamental plants best suited to the growing conditions here.