This brief elaborates on the development of sustainable agriculture in smart cities, addressing the challenges related to increasing demand for protein-rich food due to intense urbanisation. It considers development of the appropriate technologies and optimised infrastructure required for the massive uptake of smart urban farming and simultaneously enabling circular economy mechanisms for recycling waste into value assets. Data collection, storage and analytics are expected to play a seminal role for smart farming applications, therefore it will be important to ensure wide network connectivity, efficient Big Data architectures, data privacy and security.