The plant communities of the mire are nationally rare in Britain, and support two species, Black Bog-rush (Schoenus nigricans) and Blunt-flowered Rush (Juncus subnodulosus), that have restricted distributions in south-west England, and a number of species that are localised in the North Somerset area.

Surrounding the raised mire is a belt of grassland; although this is included within the SSSI, it is largely made up of common grass and herb species.

In the community in the western part of the mire, Blunt-flowered Rush, Purple Moor-grass (Molinia caerulea) and Carnation Sedge (Carex panicea) are abundant species, and this part of the mire is characterised by the presence of a number of species that favour base-rich conditions.

Black Bog-rush is locally abundant along a wet drainage ditch in this western part of the site.

The site has a species-rich flora; species that occur here but are localised or confined to specialised habitats in North Somerset are Flea Sedge (Carex pulicaris), Saw-wort (Serratula tinctoria), Meadow Thistle (Cirsium dissectum), Marsh Valerian (Valeriana dioica), Dyer’s Greenweed (Genista tinctoria), Marsh Arrowgrass (Triglochin palustris), Southern Marsh-orchid (Dactylorhiza praetermissa), Fen Bedstraw (Galium uliginosum), Devil’s-bit Scabious (Succisa pratensis) and Tawny Sedge (Carex hostiana) and Tufted-sedge (Carex elata).