Silphium laciniatum, common name Compass Plant, is an American native perennial that naturally occurs in glades and prairies of most states. Easily grown in average soils with medium moisture, compass plants feature sunflower like flowers up to 5″ wide on still resinous stems up to 9′ tall. These large flowers of yellow rays with yellow disks rise from extra large leaves that orient themselves on a north-south axis giving rise to its common name. Compass plant provides great height for the rear of a garden. Bloom time is from July to September. Silphiums are sometimes called Rosinweed. Host plant for the Silphium Moth.