An annual weed of cultivated, marginal and waste ground, often within root-crops (especially potatoes) on peaty soils. 0-445 m (Clun Forest, Salop).
This species has declined markedly since the 1962 Atlas. It is often associated with traditional arable farming and has suffered where modern methods of cultivation and weed control have been introduced.
As an archaeophyte G. speciosa has a Eurosiberian Boreo-temperate distribution; it is widely naturalised outside this range.
Light (Ellenberg): 7
Moisture (Ellenberg): 5
Reaction (Ellenberg): 7
Nitrogen (Ellenberg): 7
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 3.1
July Mean Temperature (Celsius): 14.5
Annual Precipitation (mm): 1043
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 2. 2 vols,
, Jena, (1978)