This vegetation type is dominated by Sisymbrium altissimum, accompanied by other annual plants including winter annuals, and some perennials. It occurs on sunny sites with dry, usually sandy and nutrient-poor soils. Typical habitats include roadsides, dumping grounds, disturbed sites in sand pits and around railways. This vegetation type usually appears in the second year after exposure of bare ground. Its phenological optimum is in June and July. In the Czech Republic it has scattered occurrences in warm and moderately warm areas.