A weed of pastures, creek-banks, floodplains, open woodlands, grasslands, roadsides, crops, disturbed sites and waste areas in warmer temperate, sub-tropical, semi-arid and tropical regions.
Flowering time:
Late summer, in the warmer months after significant rain.
Origin/distribution, remarks:
Native to the United States and Mexico. Naturalized in India, one of the most common weeds in Northern India.
