There was no observable change in the number of California
native species offered over time (Fig. 3). While California boasts
several dozen native trees, as mentioned above, there are only 14
native to Southern California, including such species as weedy willows that do not do well in an urban environment and cannot be
used as street trees. Many of California’s native trees do not thrive in
Southern California’s Mediterranean climate, like bristle cone pine,
white fir, and pacific yew, among others