Marshes dominated by Sparganium erectum occur in shallow, mesotrophic to eutrophic still water bodies in an advanced stage of terrestrialization, e.g. in fishpond littoral zones, pits, alluvial pools, flooded depressions in fields and meadows, and ditches and channels with slowly running water, as well as lentic sections on lower river courses. The water is usually 10–60 cm deep, but the habitat can dry out for short periods in summer. Stands of this association are usually of limited extent. They occur in lowland and colline areas across the Czech Republic.