About Erigeron bonariensis L.
Erigeron bonariensis L. grows up to 75 cm (29.5 in) in height, and its leaves are covered in stiff hairs, including long hairs near the apex of the bracts. Its flower heads have white ray florets and yellow disc florets. This species can easily be confused with Erigeron canadensis (which grows taller than E. bonariensis) and Erigeron sumatrensis. It flowers in August and continues producing fruit until the first frosts. It can be immediately recognized by its blue-green foliage, very narrow undulate stem-leaves, and purple-tipped involucral bracts. It reproduces only by seed, and its seeds are easily blown and spread by wind. Erigeron bonariensis occurs throughout the tropics and subtropics as a pioneer plant. Its exact origin is unknown, but it most likely originated in Central America or South America. It has become naturalized in many other regions, including North America, Europe, and Australia. In southeastern England, it is a rare alien, found along walls and in cracks in pavements and concrete driveways. It is widespread across all of Australia, where it grows well on roadsides, fallow fields, pastures, gardens, lawns, footpaths, parks, riparian vegetation, forest and wetland perimeters, waste dumps, and disturbed ground.
