The region of the National Park is characterized by large variety of habitats and vegetation.

Going from lower altitudes to the mountain peaks someone can find species that are also along the coast of the mainland such as the holm oak (Quercus ilex), the Greek strawberry tree (Arbutus andrachne) and the turpentine tree (Pistacia terebinthus). In higher areas (700-1100 m.) are growing evergreen or deciduous oak ecosystems (Quercus spp.). At higher altitudes (1000-1600 m.) are found the rare beech forest (Fagus silvatica), fir (Abies borisii regis) and mainly black pine (Pinus nigra).  Even higher (over 1,600 meters), exists the Bosnian pine (Pinus heldrechii) which grows at the treeline, above which the extremely unfavorable climatic conditions do not allow the development of other forest species. Along the streams extremely riparian ecosystems are created where the oriental plane (Platanus orientalis) is the dominant species, mixed with alders (Alnus glutinosa) and willow (Salix spp.).