As with other woodland in the Wye Valley Area of Outstanding Natural Beauty, Graig Wood contains many local and rare tree species. The predominant species within the wood are ash (Fraxinus excelsior) and wych elm (Ulmus glabra), although other species present include black alder (Alnus glutinosa), common beech (Fagus sylvatica) and small-leaved lime (Tilia cordata).
