The Regional Parks Botanic Garden is a 10-acre (4 hectare) botanical garden located in Tilden Regional Park in the Berkeley Hills, east of Berkeley, California, in the United States. It showcases California native plants, and is open to the public in daylight hours every day of the year except New Year's Day, Thanksgiving, and Christmas. The Garden was founded on January 1, 1940. Specimens Notable specimens include nearly all the state's conifers and oaks, a very good collection of wild lilacs (Ceanothus species), perhaps the most complete collection of California manzanitas anywhere, expanding collections of Californian native bunchgrasses and aquatics, and representatives of some 300 rare and endangered vascular taxa of California. The Garden is organized into sections, each representing a distinctive natural area in California: Southern California Shasta-Klamath Valley-Foothill Santa Lucia Channel Islands Sierran Redwood Sea Bluff Pacific Rain Forest Franciscan with subsections: Antioch Dunes Coastal Dunes Pond Collected plants include: silktassels manzanitas osoberry currants barberries Dutchman's pipe fuchsia-flowered gooseberry milkmaids western leatherwood scoliopus redbud California poppy trilliums shooting stars wallflowers fritillarias fawn lilies rock cress pussy willows California rose-bay or rhododendron woolly blue curls ninebark mountain spiraea summer holly ceanothus Chinese houses irises styrax blazing star monkeyflowers fremontias carpenteria tidy tips bush poppies brodiaeas mariposa tulips cacti clarkias mock orange western azalea matilija poppy fireweed ocean spray sweet shrub columbines penstemons scarlet mimulus buckwheats evening primroses gums larkspur lupines California fuchsias tarweeds hibiscus helianthus snowberries madrone cottonwoods deciduous oaks dogwoods hawthorn willows vine maple See also List of botanical gardens in the United States References External links https://nativeplants.org/ - Official website Botanical gardens in California Berkeley Hills Tilden Regional Park Parks in Contra Costa County, California East Bay Regional Park District