The habitats where water pepper~(Polygonum hydropiper) grows:

Brownfield
Chalk river and stream
Coastal floodplain grazing marsh
Fast flowing river and stream
Gateways and tracks
Hard cliff and cliff slope
Limestone pavement
Lowland fen
Nutrient rich eutrophic lake
Pond ditch and canal
Purple moor grass and rush pasture
Upland rush pasture
Upland spring flush