Native to the prairies, Silphium are coarse, herbaceous perennials with tall stems bearing deep yellow flowers resembling small sunflowers in midsummer and early fall. Attracting a wide diversity of pollinators, Silphium are robust plants, withstanding winds, cold winters and hot summers without complaint. They are perfect for prairies, meadows, wildflower gardens and naturalized areas. They thrive in full sun and require little to no care. Silphium are noted for their stems which exude a gummy, bitter resin when broken or cut.