A large area of the southerly hill is protected as a Site of Special Scientific Interest (SSSI) for its biological importance; much of this hill is owned by the National Trust. Its summit plateau has an extensive area of lowland heath, a rare habitat in Cheshire, and one that is particularly important for reptiles. A substantial population of lobed maidenhair spleenwort, a fern that is rare in Britain, is found here. Nationally scarce species observed in the area include the bleached pug and alder kitten moths, and the "Malthus frontalis" species of soldier beetle. The western escarpment of the northerly hill has also been designated an SSSI for its exposed Triassic sandstones.