This community is formed of stands of tall, broad-leaved herbs, dominated by Conium maculatum. It occurs in various ruderal habitats mainly in villages and their surroundings, e.g. around dung or compost heaps, at dumps, on old building rubble, at field margins and roadsides in agricultural landscapes. Currently it is on the decline in villages but increasing in open landscapes. Generally the habitats are sunny, warm and rich in nutrients. In the Czech Republic Hyoscyamo-Conietum occurs in warm lowland to colline areas.