Though the meadow is filled with predominantly native plants, sometimes non-native species take root, such as the yellow flag iris. Its resistance to deer and other wildlife led to its popularity as an ornamental plant and its introduction in the late 1700s. It expands quickly and can replace and crowd out valuable aquatic plants like cattails and other native irises, such as the Dwarf-crested iris and the Blue Flag iris.
This yellow flag Iris is actually an invasive species. (Rida Allen/Courtesy of Maryland DNR