 There are a number of organisations trying to halt the decline including Devon Wildlife Trust with its Culm Natural Networks project, Butterfly Conservation, and Natural England with its Environmental Stewardship Scheme.Culm soils have traditionally been used for grazing as they are heavy to work and acidic.In the main Culm Basin and north Devon the succession is nowadays divided into an upper Holsworthy Group and an underlying Teign Valley Group (formerly and popularly, the 'Lower Culm').