This species-poor vegetation type is dominated by Elodea canadensis, a neophyte of North American origin, which was introduced to the Czech Republic in the second half of 19th century. Its biomass is usually concentrated in deeper parts of the water column, and therefore this species requires good water transparency. It occurs in eutrophic water bodies such as fishponds, fish storage ponds, flooded sand pits, oxbows, channels and lentic sections of streams. The water in these habitats is usually 20–70 cm deep, but does not recede to expose the bottom. Elodeetum canadensis occurs across the lowland to submontane areas of the Czech Republic, but in recent decades it has been on the decline at some lowland sites due to an increase in water turbidity.