Nature-based solutions (NBS) is a relatively novel concept and real-world application has only started to proliferate in cities, which motivates addressing early attempts of cross-boundary collaboration for implementing NBS.The aim of this paper is to reflect about the process of transdisciplinary research-practice collaboration on NBS and its associated learnings, potentials and challenges.To do so, this paper reflects on one of the local urban-regional innovation partnerships within the Naturvation research project, which included urban planning practitioners, researchers and public and private organisations, and aimed to understand what NBS can achieve in cities and how to advance implementation through collaboration.This paper is based on embedded research and uses participant observation as methodological inspiration.It draws on two streams of literature to frame the reflections; (a) transdisciplinary research, to reflect on the collaborative process of research and practice engaging in learning and knowledge co-production and (b) boundary concepts, to capture the boundaryspanning nature of NBS.Observations, grey literature and the "network compass" [Schneider, F.
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