Pirin National Park falls within the Rodope montane mixed forests terrestrial ecoregion of the Palearctic temperate broadleaf and mixed forest. The plant communities in the park can be classified into several main groups: communities found around bodies of water; bush communities of the subalpine zone; grasslands, including meadows, subalpine and alpine pastures; forest communities; rock communities; and communities of secondary character, which are a result of human activity.