Managing innovation ecosystems requires firms to balance collaboration and competition while maintaining strategic differentiation. Inspired by the natural phenomenon of crown shyness-where trees create structured gaps to optimize resource sharing-this article introduces a governance framework for structuring interfirm boundaries and resource allocation. Through an analysis of real-world business ecosystems, five principles emerge: boundary modulation, structural adaptation, competitive insulation, resource partitioning, and dynamic role orchestration. This framework extends existing theories by offering practical strategies for firms navigating co-opetition, digital transformation, and platform economies. It provides business leaders with actionable insights to foster resilient, high-performing innovation ecosystems.