Native to the central United States, Black Eyed Susan (Rudbeckia hirta) can be found throughout North America in gardens and parks.
According to traditional medicine, the roots can be used to stimulate the immune system. The Ojibwa tribe used the roots as a poultice for snake bites and for treating colds and worms in children. The Menominee and Potawatomi tribes used the plant as a diuretic. Juice from the roots also has been used as drops for earaches.