The project is a self- sustaining vegetable garden located on the roof of a busy mall in the centre of Utrecht. A community of people help maintain the garden and look after the chickens and as a reward are able to eat the crops and eggs collected. The garden is used by local residents, schools and employees of the shopping mall. In summer season free events take place here. A special feature of the garden is the chicken tractor, used to transport the chickens from vegetable bin to vegetable bin during off season in order to fertilise and weed the soil for next planting season. Each time the tractor moves once every two weeks during the months between September – April.