This paper proposes a theoretical framework that aims to support firms to adopt the processes of open innovation for implementing successful environmental strategies. The aim of this paper is to investigate the open innovation processes when firms should implement environmental strategies. Through a theoretical analysis, the study highlights the links between environmental strategy and open innovation practices focusing on specific theme of open sustainability innovation model. Drawing on and extending prior studies and practice oriented approaches to environmental strategies, this study identifies some relevant open innovation tools which may provide insights for more effective models of green management. Specifically, the theoretical framework suggests implications for practitioners by shedding light on the sources and methods to translate the transferred/shared knowledge into effective environmental ideas and therefore in goals and actions, to support the strategic decision-making.