The UC Davis Arboretum and Public Garden is home to one of the largest and most diverse oak collections in the country, focusing on trees from the southwest U.S., Mexico, and the Mediterranean region. Our collection includes about 100 species, varieties, and hybrids. Massive heritage valley oaks (Quercus lobata) line the Arboretum waterway, and about 275 evergreen and deciduous oak trees grow in the 10-acre Shields Oak Grove, at the west end of the Arboretum.