A bulbous perennial herb, spreading by ant-dispersed seed on roadsides, in hedge banks, on field margins and in rough and waste ground. Lowland.
A. triquetrum was introduced into cultivation by 1759 and noted as established here by 1849, initially in Guernsey. It is now thoroughly naturalised and increasingly abundant and widespread in milder areas with scattered, sometimes short-lived, populations elsewhere. It has considerably increased in numbers and range since it was mapped in the 1962 Atlas.
Native of the W. & C. Mediterranean region.