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The Fullerton Arboretum is a 26 acre botanical garden with a collection of plants from around the world, located on the northeast corner of the California State University, Fullerton campus in Fullerton, California, in the United States. It is the largest botanical garden in Orange County, with a collection of over 4,000 plants. The Arboretum saves species that are extinct or near extinction and serves as a learning place for agricultural history. In addition to the great botanical gardens it also contains the Heritage House built in 1894 and home and office for Dr. George C. Clark.