Forests cover huge area of the range. there are few Old-growth forests mostly on the Slovene part of the highest ridge, close to Sveta Gera. These are Old-growth forest Ravna Gora, and old-growth forest on Trdina Peak. Most common are the forests of sessile oak and hornbeam and on steeper slopes are the forests of Downy Oak and hop hornbeam. Beech forests cover the highest ridges. Some endangered and protected plants are found here, such as are globally sensitive species Iris croatica and Daphne blagayana. Globally sensitive species of wild orchids and lilies can be found in areas between forests and open habitats.