Ciomadul is covered by beech and spruce forests. Around St. Ana lake, the vegetation is mostly formed by Fagus sylvatica (common beech) and Picea abies (Norway spruce) woods. Other trees include Acer platanoides (Norway maple), Betula pendula (silver birch), Carpinus betulus (common hornbeam), Pinus sylvestris (Scots pine), Salix caprea (goat willow) and Salix cinerea (grey willow). A fen contains Carex lasiocarpa (slender sedge), Carex rostrata (bottle sedge), Lysimachia thyrsiflora (tufted loosestrife) and Sphagnum angustifolium (fine bogmoss). At Mohos, vegetation consists of Alnus glutinosa (common alder), Betula pendula and Salix. The peat bog contains trees (Pinus sylvestris and Betula pubescens (downy birch)) and Ericaceae. The region of the volcano is a Site of Community Importance and some endangered plant species have been identified in the Mohos bog.