Regional Parks Botanic Garden, Native plant garden in Tilden Regional Park, Berkeley, US.

The Regional Parks Botanic Garden covers 10 acres in Tilden Regional Park in the Berkeley Hills, east of Berkeley, California. Its plantings are grouped into sections named for California regions, among them Southern California, Shasta-Klamath, Valley-Foothill, Santa Lucia, Channel Islands, Sierra, Redwood Empire, Sea Bluff, Pacific Rain Forest and Franciscan, with subsections for Antioch Dunes, Coastal Dunes and Ciénaga. The photograph shows a sloping bed of low shrubs and small plants edged with pale grey rock, narrow stone steps winding through, and a leafless grey-purple shrub in the foreground below a wall of conifers and broadleaf trees.

The garden was established in 1940 and developed into a center for preserving and studying California's diverse native plant species. Its founding reflected a growing interest in protecting and understanding the state's local flora.

The garden demonstrates how different parts of California support their own plant communities and how this diversity draws people interested in learning about the local flora they might encounter elsewhere. Visitors notice how the layout of each section mirrors the natural landscapes those plants come from.

The garden lies in Tilden Regional Park at the junction of Wildcat Canyon Road and South Park Drive, at about 210 m elevation, with views over San Francisco Bay. It is open during daylight hours every day of the year except New Year's Day, Thanksgiving and Christmas. Paths wind over sloping ground with stone steps, so wear walking shoes.

The site holds one of the most comprehensive collections of California conifers and oak trees in one place. Additionally it preserves about 300 rare and endangered plant species that appear in state inventories.