An annual weed of light soils in cultivated fields, nursery plots, garden centres and gardens, and in waste ground in urban areas. Lowland.
This species was introduced as a garden plant to Kew Gardens by 1796, from where it had escaped by 1860 (and was known as `Kew Weed`). It has spread steadily since then, aided by transport from nursery gardens and occurring also as a wool alien. It is widespread as a casual, sometimes persisting, and has certainly undergone a considerable expansion of range and frequency since the 1962 Atlas.
Native of S. America; widely naturalised in other countries.
PLANTATT - Attributes of British and Irish plants. (.zip 1455KB) This dataset was compiled and published in 2004, and last updated in November 2008. Download includes an Excel spreadsheet of the attributes, and a PDF explaining the background and nomenclature. Note that the PDF version is the booklet as published, whereas the Excel spreadsheet incorporates subsequent corrections. A hardcopy can be purchased from the Centre for Ecology and Hydrology.
Atlas text references
Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols,
, Königstein, (1986)
Vergleichende Chorologie der zentraleuropäischen Flora. Volume 3. 2 vols,
, Jena, (1992)
The biology of Canadian weeds. 58. Galinsoga parviflora and G. quadriradiata (=G. ciliata),
, Canadian Journal of Plant Science, Volume 63, p.695-709, (1983)