Grass Wood, Wharfedale

Grass Wood is an ancient woodland of 88 hectares (220 acres) in Wharfedale, North Yorkshire, England, that has an exceptional ground flora of woodland wildflowers. The area was notified as a Site of Special Scientific Interest in 1955 for upland broadleaved woodland. The site is also listed in A Nature Conservation Review under the entry for "Conistone Old Pasture and Bastow Wood". The Yorkshire Wildlife Trust completed the purchase of the site in 1983 and manages it as a nature reserve. The whole of the area of the SSSI is registered common land. Two adjacent sites Bastow Wood and Conistone Old Pasture are also notified as SSSIs, the former for broadleaved woodland and calcareous grassland, and the latter for calcareous grassland and limestone pavement. Grass Wood is the last surviving native site in Britain for the Lady's Slipper Orchid (Cypripedium calceolus).