Green Infrastructure (GI) is a strategically planned network delivering and enhancing diverse ecosystem services whilst preventing further biodiversity loss. Although not mandatory for EU members to implement GI, it is increasingly advocated as a tool for landscape planning. In 2016, the Swedish Government mandated the County Administrative Boards (CABs) to design regional GI plans using a collaborative process. This study explored the GI collaborative process in the region of Scania in southern Sweden, focusing on forest as an important component of Swedish landscapes. We interviewed 14 different stakeholders who participated in the process, and analysed the preconditions, inner workings and outcomes of collaborative GI planning. Despite remarkably different expectations, the perceived outcomes were consistent. Most stakeholders perceived the process as mainly informational rather than deliberative and, in general, use of the GI plan was limited. Despite successful finalisation of the plan, collaboration as a long-term process has not been achieved, which may limit the realisation of activities that foster GI. Scania’s GI planning illustrates the defects of top-down approaches with insufficient resources, failing to address the stakeholders’ trust and positioning. A lack of inclusivity and deliberation undermine the legitimacy of collaborative processes, discrediting the very concept of GI in Sweden. Our analysis indicates that a genuine collaborative process and a long-term commitment to implementing GI is unachievable without sustained and substantial governmental funding, capacity development at the lead agency, thorough consideration of prehistory, and targeted measures to increase trust among stakeholders.