With 26 acres of land, the Fullerton Arboretum is the largest botanical garden in Orange County. Home to over 4,000 plants, it is divided into four areas: Cultivated, Woodlands, Mediterranean, and Desert Collections. The gardens aim to educate visitors about wildlife conservation and offer classes for budding scientists to cultivate their own bonsai trees and learn how to compost. One of the main attractions of the garden is the Heritage House. Built in 1894 by one of the first doctors of Fullerton, it currently serves as a museum to 19th-century medical practices and family life.