Erigeron bonariensis is a species in the family Asteraceae, found throughout the tropics and subtropics as a pioneer plant; its precise origin is unknown, but most likely it stems from Central America or South America.

It has become naturalized in many other regions, including North America, Europe and Australia.

It is instantly recognisable by its blue-green foliage, very narrow, undulate stem-leaves, and purple-tipped involucral bracts.

[4][5][6][7] E. bonariensis is a rare alien in southeastern England, found along walls and in cracks in pavements and concrete driveways.

[citation needed] It is widespread throughout Australia, where it thrives on roadsides, fallows, pastures, gardens, lawns, footpaths, parks, riparian vegetation, forest and wetland perimeters, waste dumps and disturbed grounds.