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In the Prairie ecozone, there is a variety of natural vegetation, but not an abundance of vegetation. In the drier areas of the ecozone, they have short-grass prairie. In the areas with more moisture, they have long-grass prairie. Spear Grass, Wheat Grass, and Blue Grama Grass are the most common types of grass in the ecozone. Most of the ecozone is mainly grassland in the southern part of the ecozone. In the northern edge of the ecozone, they are covered with trees, most of them trembling aspen and balsam poplar. The lake areas and the wetlands have the most abundance of natural vegetation. Some types of vegetation that grows in that area are bur oak trees, aspen trees and many types of shrubs. Today, there are less natural vegetation remaining than before. This is because the grassland in the ecozone is being changed into cropland.