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

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

[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.