We hear much about food in a circular economy but this is not possible – feeding a city is, by definition, a linear supply chain heavily reinforced by single use plastic. We offer an environmentally and economically sustainable alternative to a vertical farm. Installing an automated greenhouse on a non-loadbearing surface such as the roof of a retail warehouse or hotel offers many benefits to make the building more efficient and avoid the need for a rural glasshouse to pay to create CO2 and then follow a carbon intensive supply chain to reach a building that already pays to dump the perfect environment for a greenhouse and must now dispose of vast amounts of transit only packaging we can show is not required.