Red Amaranth is a tall annual herb topped with clusters of dark pink flowers. The plant can grow up to 6 ft tall in height, and blooms in summer to fall. Stems are erect, green or reddish purple, branched distally, mostly in inflorescence, to nearly simple. Leaves are carried on stalks half as long as, or equaling the blade. Blade is rhombic-ovate or ovate to broadly lance shaped, 3-15 × 1.5-10 cm, occasionally larger in robust plants, margins entire.