A perennial herb of basic and neutral soils, occurring in hedge banks, on woodland margins and rides, in field-borders and open grassland, on roadsides and railway banks, and sometimes in waste places. It reproduces and spreads by seed. 0-365 m (N.W. Yorks.).
The map suggests a slight decline in the distribution of A. eupatoria since the 1962 Atlas.
Eurosiberian Southern-temperate element; widely naturalised outside its native range.