This vegetation type is dominated by Chaerophyllum bulbosum, a tall, biennial to perennial herb. Its natural habitats are banks and floodplains of lowland streams, but it has also spread to ruderal habitats in cities and villages and their surroundings. It occurs on roadsides, in farm yards, in waste places and near compost piles. Soils are wet to intermittently wet and rich in nutrients. In the Czech Republic this association is found in warm areas, especially in the floodplains of lowland rivers.