The dry stone walls that divide the pasture into fields are a well-known feature of the Mendips. Constructed from local limestone in an "A frame" design, the walls are strong yet contain no mortar; many have been neglected and allowed to disintegrate, or have been replaced or contained by a mix of barbed wire and sheep fencing. These dry-stone walls are of botanical importance as they support important populations of the nationally scarce wall whitlowgrass ("Draba muralis"). Amongst the plants which occur in the area are the Cheddar pink ("Dianthus gratianopolitanus"), purple gromwell ("Lithospermum purpurocaeruleum"), white rock-rose ("Helianthemum apenninum"), Somerset hair-grass ("Koeleria vallesiana"), and starved wood-sedge ("Carex depauperata").