1, the family is different. Amaranth, also known as purple back vegetables, red phoenix vegetable, etc., is a perennial herbaceous plant in the genus Asteraceae. Amaranth, also known as green amaranth, red amaranth, red cabbage, etc., is an annual herb in the genus Amaranthaceae.

2, the shape is different. Amaranthus 50-100cm high, leaf stalked or nearly sessile, leaf blade obovate or oblanceolate, 5-10cm long, 2.5-4cm wide, the edge of the irregular wavy teeth or small cuspidate teeth, the color of one side of the purple side of the green. Amaranth 80-150cm high, petiole 2-6cm long, leaf green or red, leaf blade ovate, rhombic-ovate or lanceolate, 4-10cm long, 2-7cm wide, entire or undulate margin, leaf blade green or often red, purple or yellow, or partly green mixed with other colors.