The term Barren vegetation, or just barren, describes an area where plant growth is sparse, stunted, or possesses little biodiversity. Poor growth may occur due to high winds, climate, salt spray, infertile or toxic soil, or heavy exploitation by man.
Barrens may look poor—with shrubs or moss instead of trees—but some have rare plant and animal species that can't compete in nutrient-rich environments. Many serpentine barrens are known for unique assemblages of plant species. Some barrens, such as pine barrens, are well-wooded with fairly tall trees, although the only plants present are those which are adapted to a low nutrient supply.