Tea Tree Gully is a suburb in the greater Adelaide, South Australia area, under the City of Tea Tree Gully. Tea Tree Gully is in the City of Tea Tree Gully local government area, the South Australian House of Assembly electoral district of Newland and the Australian House of Representatives Division of Makin. The suburb acquired its name from the white flowered 'tea trees' (Leptospermum lanigerum) that grew in the gully. Their leaves were brewed as a tea substitute by early settlers. John Stevens originally purchased land in the area, subdividing it in 1850 and naming the settlement Steventon.