Northern California Coastal & Inland Valleys
If you're really into railroad gardening, try reading a few books on the subject. One of my favorites is All Aboard: The Practical Guide to HO Model Railroading (Model Railroad Handbook No. 21), by Bob Hayden (Kalmbach Publishing Co., 1991; $13).
Bay Area Garden Railroad Society
Combine miniature railroading and gardening? Why not? Miniature railway enthusiasts in the San Francisco Bay area who combine their love of gardening with their rail hobby have set up their own Web site (www.bagrs.org). By combining trains with gardening, construction, and model making , you can customize your own tiny world. Finding the right plants to keep everything in scale is a challenge but lots of fun!