the scientific name of Setaria viridis, which belongs to the genus Setaria, belongs to Gramineae. Annual, like warm environment, not cold-resistant. Generally, after the temperature drops in autumn, it will slowly turn yellow, wither and die. However, it has strong reproductive ability, and will continue to germinate and grow new plants after the seeds fall and the temperature rises in the second year. It mainly grows in the wilderness and on both sides of the road, and is a common weed in dry land crops.