[2] Wilderness woodlands are not ancient woods and appear to have resulted from colonisation of trees on former grazing land and some parts of the site were open until relatively recently.

The shrub layer is dominated by brambles (Rubus fruticosus) and there are two areas of bog myrtle (Myrica gale), numbering 20 bushes altogether and making up what may be the largest population of this species left on the Isle of Wight.

The ground vegetation has areas where the dominant plant is the tussock sedge (Carex paniculata) and some of these exceed 1.5 metres (4.9 ft) in height while the wettest parts of the wood retain relicts of the flora of the original open bog such as Sphagnum auriculatum.

The most diverse area of the Wilderness SSSI is where water flushes out of the soil and the sward is dominated by sedges and rushes among which are cottongrass (Eriophorum angustifolium) and other wetland grasses and herbs.

[2] In summary, the Wilderness is an unusual site where oak and alder woodland has grown in peaty soils, where the herb layer is dominated by large clumps of tussock sedge.