The California Nursery Co. was founded in 1884 by John Rock. It grew to become the largest retail nursery west of the Rockies. The park hosts a variety of trees, a Japanese and Rose garden, fruit orchard, an 1835 Vallejo Adobe as well as other historical exhibits. It is a great place for history buffs, garden lovers and horticulturists.
The visitor center has many indoor and outdoor displays and real samples of volcanic rock and other area geology. A self-guided brochure is available that you can use on the volcanic Trail, which contains most of the stops on the self-guided volcanic tour. There are about ten miles of trails including a trail leading up to Round Top (elevation 1763 ft.) that is made up of lava and volcanic debris left over from a 10-million-year-old volcano. There is a bathroom and drinking fountain by the visitor center.