A biennial or perennial herb of dry sites, mainly on chalk or limestone, less frequently on sands and gravels, typically in places where the vegetation cover is broken or in areas of open soil or stony ground. It occurs in dry grassland, on banks, woodland margins, rides and scrub, in quarries and pits, screes (but rarely on cliffs), on the more vegetated parts of sand dunes, on roadsides and rough ground. Most sites have a southerly aspect and are unshaded. 0-305 m (Kingsdale, Mid-W. Yorks.).
There has been no appreciable change in the distribution of I. conyzae since the 1962 Atlas.
European Temperate element; it reaches its northern limit in Jutland.
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