In this article, urban allotment gardens (UAGs) are discussed as one of the alternative urban development frameworks - Slow City. The UAG concept as well as the Slow City agenda aims to protect and enhance strong community relationships, decision making, civil engagement, group learning, and leisure practices for people of all ages in close proximity to green spaces. The authors argue that the statutory aims, organizational culture, and governance rules of UAGs are largely coherent with the formal Slow City agenda. The authors analyze the threats to sustainable cities and the alternative urban development agendas in the context of Polish allotment gardens. With increasing problems of soil pollution, abandoned gardens, informal housing, and limitation of access to the green areas of the UAGs for other inhabitants, the pressure to reduce the number of UAGs is reinforced.