Sonoma Botanical Garden, Botanical garden in Glen Ellen, United States

Sonoma Botanical Garden is a sprawling garden in Glen Ellen that combines Asian woodland collections with California native oak savanna across its grounds. Walking paths connect different botanical zones, allowing visitors to explore the varied plant collections at their own pace.

Jane Davenport Jansen founded the garden in 1987 on former quarry land and launched seed-gathering expeditions to Asia that same year. These early collection efforts established the foundation for the botanical diversity visible in the garden today.

The garden's name recalls its origin as a sandstone quarry that supplied road foundation stone. Its Asian plantings stem from annual seed-collecting expeditions begun in 1987 across Hubei, Sichuan, Yunnan, Tibet, Taiwan, Japan, India's Himachal Pradesh and Nepal. Many plants are grown from wild-collected, scientifically documented seed, and some are sold in the gift shop.

The garden is reached via Sonoma Highway (12841 Sonoma Highway) in Glen Ellen, at an elevation of about 105 metres, with roughly 635 mm of rain a year. Visits are by prior request, so arrange entry before setting out. The grounds cover 61 acres on a former quarry hillside, and paths climb the slope.

The garden's herbarium code is GELLE, and it is a member of Botanic Gardens Conservation International. Its roughly 25,000 wild-origin plants represent more than 2,000 species, most planted from 1990 onward, and some are sold in the gift shop.