Food sovereignty has become one common banner of urban agriculture initiatives. In the Swiss context, it is a standard reference of community-supported agriculture (CSA), community garden initiatives, local food policies, urban farms, or regional labels. What does food sovereignty mean in these initiatives? By whom is it mobilized? How is it concretely converted and how is it appropriate by public policy? Our hypothesis is that food sovereignty is a Nirvana concept (Molle, 2008); a term that is sufficiently vague so that different actors and politicians can refer to it without concrete consequences on their practices, but also a boundary object facilitating linking actors with very divergent opinions. In this chapter, we highlight the dual function of food sovereignty in relation to urban agriculture: between “business as usual” and common ground for the negotiation of local agricultural and food policies.