Nurseries: (some have very educational websites!)
Las Pilitas Nursery, Escondido www.laspilitas.com
Theodore Payne Foundation for Wildflowers and Native Plants, Sunland www.theodorepayne.org
Tree  of Life Nursery, San Juan Capistrano www.treeoflifenursery.com
Grow Native Nursery, Westwood, Los Angeles Wednesday through Sunday, 9 a.m. until 5 p.m.  The Westwood nursery is adjacent to the Jackie Robinson Stadium on the grounds of the West L.A. Greater Los Angeles Health Care System. From I-405 take Wilshire Blvd. exit, travel east to Sepulveda Blvd., travel north to Constitution Ave., travel west past Davis Ave., to nursery driveway.

Water-wise and wildlife friendly gardening:
Metropolitan Water District of Southern California: www.bewaterwise.com (check out Garden Spot and Classes)
Rancho Santa Ana Botanic Garden: http://www.rsabg.org
Wildscaping Your Garden: www.wildscaping.com
Gardening for Songbirds, Hummingbirds & Butterflies:  http://www.wildscaping.com/pdfs/Wildscaping_plantlist_0705.pdf
University of California (UCI) Integrated Pest Management (IPM) Home and Garden:  http://ipm.ucdavis.edu/PMG/menu.homegarden.html

Organizations:
Audubon Society (local): http://www.pvsb-audubon.org/index.html
California Landscape Contractors Association: http://www.clca.org/
California Native Plant Society: www.cnps.org
National Wildlife Federation: Learn how to earn your own NWF Certified Wildlife Habitat designation at http://www.nwf.org/Get-Outside/Outdoor-Activities/Garden-for-Wildlife/Create-a-Habitat.aspx

Businesses:
Wild Birds Unlimited: http://torrance.wbu.com
Enviroscape: http://www.enviroponds.com/
Neighborhood Consulting Arborist: www.ncatree.com
Garden Magic Company: http://www.gardenmagiccompany.com

Books:
Trees and Shrubs for Dry California Landscapes
Bob Perry, Land Design Publishing, 1981
A coffee table size book (less expensive in paperback) with excellent color photographs. It covers many native and non-native species that thrive in our climate. This timeless book is especially useful to landscapers showing clients potential plants and trees.

California Landscape Garden: Ecology, Culture, and Design
Mark Francis and Andreas Reimann, University of California Press, 1999
A very useful guide to the understanding of the general principles of landscaping with California natives. Recommended for "do it yourself" homeowners.

California Native Plants for the Garden
Carol Bornstein, David Fross, and Bart O'Brien, Cachuma Press, 2005
The best and most complete book to date devoted to native gardening. Covering over 500 plants with extensive profiles accompanied by excellent color photos, it also includes information on California habitats, horticultural history, design, resources, and more. This is a "must have" book for backyard gardeners and professional landscapers.

Care and Maintenance of California Native Plant Gardens
Bart O'Brien, Rancho Santa Ana Botanic Garden, 2006
Available from California Native Plant Society: A very welcome addition to the native plant library. Chock full of information on planting, watering and maintaining native gardens. The bilingual text is an excellent idea since a large percentage of Southern California gardeners are Spanish speakers.

Designing California Native Gardens
Glenn Keator and Alrie Middlebrook, University of California Press, 2007
A practical native landscaping book with plans, photos and plant descriptions. An emphasis on natural habitat communities makes this an outstanding addition to the native library.

Native Gardens for Dry Climates
Sally Wasowski, Clarkson Potter, 1995
An inspirational and informational book for gardening with drought tolerant plants throughout the Southwest.

Native Treasures: Gardening with the Plants of California
Nevin Smith, University of California Press, 2006
A compilation of native gardening profiles from Fremontia over the years by an expert on the subject.

Sunset Western Garden Book
Edited by Kathleen Brenzel, Sunset Publishing, 2007
The bible for Western United States horticulture. Each new edition includes more California native plants and greater emphasis on drought tolerant gardening techniques.