Evening Primrose gets its name from its yellow flowers which bloom in the evenings, and it’s found growing in North America and some parts of Europe. First Peoples, also called Native Americans, used Evening Primrose as a food, consuming its roots, leaves, and seeds. The Native Americans used parts of the plant for a variety of medicinal purposes such as bruises, hemorrhoids, and sore throats. Oil from the Evening Primrose seeds has large quantity of fatty acids, particularly omega-6 fatty acids. Evening Primrose Oil (EPO) is derived from cold-pressing the Evening Primrose seeds. EPO has several treatment uses.