The forest is part of the
Central European mixed forests ecoregion. Trees in the Polish part of the forest are 40% spruce, 22% oak, 19% pine, 11% birch, 6% alder, and 2% linden and other species. Common plant communities include
Tilio-Carpinetum forest on dry ground, composed of oak, spruce, linden, ash, alder, maple, elm, hornbeam, and birch. Undergrowth is generally sparse.
Fraxino-Alnetum forest is found in marshy areas, with alder, spruce, linden, ash, and, less frequently, elm. Understory shrubs include bird cherry (
Prunus padus), hazel, guelder rose, and saplings of canopy trees. Ground-elder (
Aegopodium podagraria) and nettle (
Urtica dioica) are common in the ground layer. ==History==