Located on St. Mary's in the Isles of Scilly, Cornwall, Scillonian Hedges aims to create a larger wetland system by transforming improved grassland into wet grassland, addressing issues of flooding on the island and enhancing habitats for migratory birds. Cornish hedges are utilised as a multifunctional tool to protect habitats, reduce freshwater loss due to wind evaporation, promote rainwater harvesting, increase wetland storage capacity, stabilise soil, and to form dykes to shield freshwater wetlands from coastal flooding. The new island wetland system has been divided into swamp, marsh and wet grassland based on landscape function and environmental characteristics.

Cornish hedge laying, an endangered traditional skill, is also a key focus of the project, while also serving as a network of pathways within the landscape. To preserve and promote this heritage, educational opportunities will be provided for visitors to learn and participate in hedge construction. The hedges they build could become a permanent part of the region's hedge system, thereby contributing to the conservation of both the landscape and the craft itself.