Royal Edinburgh Hospital has a long standing association with mental health services going back to the site’s development in 1813. In recent years it has developed strong associations with horticultural groups. But its campus lacked a coherant structure, like many hospital campuses that had developed incrementally over time.The outline business case developed by NHS Lothian set out the strategy which would help provide immediately accessible, external therapeutic spaces throughout the hospital campus for the delivery of mental health services. erz were appointed as landscape architect, working with NHS staff to develop and refine the clinical brief. This project goes beyond a landscape-led masterplanning approach and shows how landscape and architecture can be fused to ensure that the social and health value of access to high-quality landscape can drive the design of the built form.