The dominant plants are sages (Lamiaceae) and evergreen oaks and, in drier areas, chamise (Adenostoma fasciculatum), manzanita (Arctostaphylos pungens), and species of Ceanothus.
The Arboricultural Association was founded in 1964.The objective of the Arboricultural Association is to advance the science of Arboriculture for the public benefit.