This vegetation type is dominated by Bromus tectorum, a winter annual grass. It develops on warm, sunny sites with dry, sandy or gravelly soils. It is common along railway tracks, on roadsides and on tops of old walls and ruins in both cities and villages. The phenological optimum of this vegetation type is between May and early June, and later on the dominant species disappears. In the Czech Republic this association is common in warm lowland and colline areas.