The park has extremely varied vegetation with open forests around the foothills of the peaks, subtropical rainforest above 600m, montane heath shrublands towards the summit of the peaks, cool temperate rainforest on the summit of Mount Ballow, and mallee eucalypt shrublands on Mount Maroon. Many rare and unusual plant species grow in the park including the endangered Maroon wattle, and the rare mallee eucalypt Eucalyptus codonocarpa, Mount Barney bush pea and Hillgrove spotted gum.