The area consists of northern hills showing the entire lifespan of forests and spruces in particular from seedlings to decaying old trees. Lower down, lush herb-rich forests and sparkling springs brighten up the landscape in depressions. On the hills, the altitude creates fell-like conditions that provide shelter for demanding species that thrive in the summit areas.

In terms of plant species, Iivaara is covered by mixed forest typical of the area that is dominated by pines and spruces. Some of the tree-covered area is very fertile, which is reflected in the diversity of species found there. Endangered yellow marsh saxifrage thrives in the fertile mires of the area. The springs and herb-rich forests host a diverse array of species. Alpine bearberry and Alpine clubmoss are among the fell species found at the top of Iivaara. Calypso and baneberry also grow in the Iivaara area; both are rarities of lime-rich soil areas.