The habitats where giant spear moss~(Calliergon giganteum) grows:
| Blanket bog |
| Coastal floodplain grazing marsh |
| Lowland fen |
| Nutrient rich eutrophic lake |
| Purple moor grass and rush pasture |
| Turlough and fluctuation mere |
| Upland acid grassland |
| Upland spring flush |
| Wet woodland |