This vegetation type is usually dominated by Persicaria hydropiper or the neophyte Bidens frondosa. It occurs on the banks of fishponds, water reservoirs, rivers and brooks, bottoms of fish storage ponds, seasonally flooded pools in river floodplains, ditches, channels, wet arable fields, and puddles on forest paths and clearings. Water retention is not persistent and soils tend to dry out quickly. It is poorer in nutrients than in other associations of the alliance Bidention tripartitae that are confined to muddy substrates. This vegetation type is common from lowland to submontane areas across the Czech Republic.