Agriculture in London is a rather small enterprise, with only 8.6% of the Greater London area being used for commercial farming, nearly all of which is close to Greater London's outer boundaries. There are a few city farms closer to the centre of the city and about 30,000 allotments. There are 135.66 square kilometres (135,660,000 m2) of farmland in the Greater London area. Nearly all of the farmland in the London area is a basis for the growing culture.