Co-implementation involves collaboration between people and partners to put solutions into action. In the case of nature-based solutions (NbS), co-implementation means involving local citizens and stakeholders alongside municipal actors in the provisioning and construction of the co-designed solutions. This represents a crucial step of the co-creation process, as the involvement of these groups in NbS implementation helps stakeholders to understand, support, and maintain the implemented NbS. More details about co-implementation with CLEVER Cities and particularly in the partner city of London, Thamesmead, can be found in this brief.