The exposed summits and ridges of Glenfeshie support what is perhaps the closest to natural vegetation in Scotland. Only a specialised group of the hardiest plants can survive the periods of long-lying snow, bitter winter winds and low temperatures here, creating a flora that is similar to arctic Scandinavia. Low, stunted swards of heather Calluna vulgaris, through which white Cladonia lichens creep, make up the bulk of climax heaths.

Primitive plant species such as fir club moss (Huperzia selago) and alpine club moss (Diphasiastrum alpinum) punctuate the sward, and in places heather gives way to thick, silvery mats of woolly hair moss (Racomitrium lanuginosum).