Quercus lobata-Valley Oak
The largest of the California oaks, Quercus lobata eventually
forms a massive tree to 60-70 feet tall and wide. This deciduous
tree is primarily found in the interior valleys and the southern
foothill regions of California. Its deep root system allows it
to withstand long periods of drought. The California white oak
can also handle extremely cold temperatures, according to Sunset
Western Garden Book. USDA Zone 7.