The habitats where yellow iris or flag~(Iris pseudacorus) grows:

Brownfield
Coastal floodplain grazing marsh
Dune slack
Hard cliff and cliff slope
Limestone pavement
Lowland fen
Moist damp verges and banks
Nutrient rich eutrophic lake
Pond ditch and canal
Purple moor grass and rush pasture
Reedbed
Sand dune
Traditional orchard
Upland rush pasture
Upland spring flush
Wet woodland