This homeowner was way ahead of the green curve. The garden was created 15 years ago when most of us didn’t really understand what California Native meant. It is special to them because they created it knowing it was good for the environment - and they did it on a budget!
They really don't water except in the summer. Then they give the roses a soak once a week with a slow flow hose and keep the plants in the main yard alive with a sprinkler once a week. A kitchen timer is used to keep the watering to a minimum.