Established in 1979, the Fullerton Arboretum has served the community as a premier resource for ecological, horticultural and historical education. The Fullerton Arboretum is the largest botanical garden in Orange County. Encompassing 26 lush acres, The Fullerton Arboretum has assembled a permanent collection of over 4,000 unique and unusual plant species from around the world. With its ponds, streams and wildlife, the Fullerton Arboretum offers a tranquil retreat from a fast-paced urban life.