This site is characterised by maritime European dry heaths, but along the Chapel Porth valley it supports stands of Dorset heath Erica ciliaris. At this site the species occurs on drier substrates than in Dorset.
The dry heathland in this site represents typical examples of wind-pruned, ‘waved’ H4 Ulex gallii – Agrostis curtisii and H8 Calluna vulgaris – Ulex gallii heath, with some maritime features. Several noteworthy species occur in the site, including bristle bent Agrostis curtisii, red-flowered kidney vetch Anthyllis vulneraria var. coccinea, Portland spurge Euphorbia portlandica and hairy greenweed Genista pilosa. Scattered areas of Temperate Atlantic wet heaths with Erica ciliaris and Erica tetralix also occur.