Jim and Marian entered Trerieve into Countryside Stewardship, a DEFRA funded agri-environmental scheme, in 1999. This scheme helped to provide capital to create the wildlife pond and traditional orchard, with varieties such as Cornish Longstem, and the wall that partly encloses it. It also paid for rebuilding some of the Cornish hedges, stone faced earth banks, which not only provide shelter for the livestock, but also are a haven for all flaura and fauna. This scheme came to an end in 2009, and in 2010 the whole of Trerieve Farm and the land at Keveral Mill and Hannafore was entered into the Higher Level Stewardship Scheme, which is administered by Natural England.

Some fields have been taken out of arable production, and now contain a fantastic variety of coastal grasses and plants, such as Birds Foot Trefoil. Cereal stubbles are also kept over winter to provide an attractive habitat for Cirl Buntings under this scheme. Funding has been provided to protect the remains of the medieval Lammana Chapel, at Hannafore.