oldest and one of the largest thematic amusement parks in the United States. It is located in Buena Park, Calif.

Knott's Berry Farm originated as a farm and nursery, founded by Walter Knott (b. Dec. 11, 1889, San Bernardino, Calif., U.S.—d. Dec. 3, 1981, Buena Park, Calif.) and his wife, Cordelia Knott (née Cordelia Hornaday; b. Jan. 23, 1890—d. April 23, 1974, Buena Park, Calif.). Knott, the son of a farmer, grew up in Pomona, Calif., where he met and married his high-school friend Cordelia. In 1920 they leased 10 acres (4 hectares) of land in Buena Park in nearby Orange county and grew berries, selling them from a roadside stand and to local grocers. Cordelia also sold her own preserves, relishes, and candy, and in 1928 they opened a tea room and berry market, which in the 1930s evolved into a restaurant (known especially for chicken dinners) and an amusement park initially featuring rides and a mining ghost town.

The Knotts became associated with their best-known berry, the “ boysenberry,” in 1932, when Walter assumed the nurturing of six hybrid plants developed by an Anaheim horticulturist, Rudolph Boysen, who had developed a cross between a loganberry, red raspberry, and blackberry. Within a decade, production of boysenberries had become hugely prosperous. In 1960, however, the berry farm in Buena Park ended, overtaken by the amusement park, and the Knott family acquired extensive acreage near Modesto, central California, for growing berries. The family ended its ownership of Knott's Berry Farm in 1997, when the park was sold to Cedar Fair, L.P.

By the early 21st century, Knott's Berry Farm had grown to some 160 acres (65 hectares). The amusement complex celebrates such themes as the Old West, early Spanish California, and the 1920s flapper era. It also features a replica of Independence Hall, Philadelphia. In addition, a resort hotel is located in the park.