The main objective of the COST Action TU1201 is to study urban Allotment Gardens and their relevance for urban sustainable development by creating a scientific platform. During the last 20 years, due to densification of urban areas and increasing lose of green infrastructure, both a revival of interest in Allotment Gardens and simultaneous competition of other kind of land use occurred. The multi-character and partly contradictory nature of the Allotment Gardens makes it a relevant issue to be studied within different European urban contexts. Through selected case studies and in-depth research (into the areas of policy and urban development, sociology, ecology, urban design), focus of the Action will be on both qualitative and quantitative studies to comprehend challenges and opportunities in areas of urban design, sociology, ecology and policy. The relevance and potential of AG for urban development so far has not been studied from a European perspective. The Action will contribute to a better understanding of framwork conditions for policy actions in different European countries and emphasises to involve young researchers through well-organised networking practice.