The promise of smart cities to deliver new urban efficiencies and optimizations for sustainability is increasingly being questioned for its anthropocentric, universal, and top-down perspectives. Framingcities as computers has been critiqued for its limiting understanding of cities, as well as its lack of dealing with the complexities of real messy cities, with diverse knowledge and lived experiences. However, smart technologies have also been highlighted as having the potential to help us better understand more-than-human perspectives and to reconnect us to the world around us. Situated in thefield of design for social innovation, this thesis contributes to the emerging body of work that is exploring how digital urban environments can include local knowledge and more-than-human perspectives. In a co-design process with the urban agriculture community of Sjöbergen in the city of Gothenburg in Sweden, this thesis explores how local knowledge and values about- and in urban nature can help us think differently about the future of sustainable smart city concepts. With a design process guided by research through design and co-design, this thesis is imagining other smart city narratives that go away from the current top-down and universal perspectives and instead are inspired by values of Sjöbergen of reuse, maintenance, collectivity, and knowledge sharing. The design contribution of this work is a design proposal of a smart city service that reuses old smartphones of citizens into smart city technologies for individual and situated purposes. The design proposal aims to show an alternative view of smart cities grounded in local values and more-than-human perspectives.