In this paper, we present results from an ongoing participatory design research project that focuses on the design and evaluation of a tagging-system and corresponding visualizations to support actors and visitors of an urban gardening project. The contributions of this work are threefold. First, it addresses the yet underexplored field of integrating context information beyond location and time into mobile tagging systems and folksonomies. Second, it suggests novel visualizations to explore tagged data and folksonomies beyond tag clouds and simple map representations on mobile phones. And third, it gives novel insights into supporting the embedded practices of a DIY (Do-It-Yourself) urban gardening community with interactive systems based on ethnographic fieldwork and participatory design.