This fine area of ancient semi-natural woodland contains stands of alder and birch in the wetter areas with oak, rowan and ash where the ground is drier. At the northern end of the site are butterwort, lousewort and marsh violet.
Nearer the burn there are fens dominated by yellow flag and meadowsweet. Parts of the site are bracken-dominated but contain a good spring flora. Birds include pied flycatcher, redstart, wood warbler, cuckoo and woodcock. Roe deer are now excluded to encourage regeneration of parts of the woodland, which seems to be very successful particularly for birch. The reserve is managed in association with the Defence Estates of Northumberland National Park Authority.