Linmer Moss () is unusual within Delamere Forest in having a fen environment which is not dominated by "Sphagnum" species. The vegetation is predominantly tussock sedge and reedmace. Marsh fern and white sedge, which are rare in Cheshire, are found here; other species include cuckooflower, marsh bedstraw, marsh cinquefoil and "Sphagnum squarrosum". The site has experienced rapid changes in water levels during its history, and contains the trunks of birch trees which died when the area flooded. It is now being colonised by alder and willow.