The habitats where alder~(Alnus glutinosa) grows:

Altantic hazel wood
Atlantic oak wood
Brownfield
Coastal floodplain grazing marsh
Limestone pavement
Lowland dry oak and birch wood
Lowland fen
Lowland mixed oak and ash wood
Purple moor grass and rush pasture
Raised bog
Reedbed
Turlough and fluctuation mere
Upland birch wood
Upland mixed ash wood
Wet woodland
Wood pasture