 Harptree Combe is a narrow limestone gorge containing a variety of habitats, including Ash woodland, rough grassland, natural and artificial rock faces, and a small, marshy stream.The valley wood has been identified as an ancient woodland site, rich in tree and shrub species, and with a ground flora containing plants such as Herb Paris "Paris quadrifolia"), indicative of such undisturbed habitats.Several other uncommon or local plants, such as Small Teasel "Dipsacus pilosus" and Autumn Crocus "Colchicum autumnale", also occur.