|Other names:||redroot amaranth, red-root amaranth, careless weed, rough pigweed, Pigweed|
A reddish-colored stem and taproot give this weed its common name. Leaves are mostly long and lance-shaped. Stiff, prickly seed clusters form at ends of stems. Thrives in open, distrubed areas in full sun. Grows 3 to 8 ft. tall.