California Gardening Cooperative Extension: Resources for the California home gardener provided by the University of California.
California Gardens: Includes plant photos and descriptions; information about gardening methods and projects; and a garden calendar.
Garden California: Includes a database of landscape plants, a garden problem solver, a gardening calendar, photos, forum, and links.
Master Gardeners Online: Advice to the California home gardener from the University of California Extension. Includes tips, events, publications, projects, and links. Includes separate sections for many counties.