This paper uses a case study of Sheffield, UK, to explore the area of land potentially available to grow fruit and vegetables within urban areas, including both soil-based horticulture as well as soil-free controlled-environment horticulture on flat roofs. The study estimates that existing allotment land in Sheffield can produce enough fruit and vegetables for around 3% of the city’s population. The paper suggests that by using 10% of domestic gardens and 10% of the additional suitable land identified, this could produce enough fruit and vegetables for 12% of Sheffield’s population. The paper explores the related labour needs as well as the potential of roof.