Great Fen-sedge

Cladium mariscus

  1. Wildlife
  2. Grasses
  3. Great Fen-sedge


Also known as 'Saw-sedge', Great Fen-sedge is a tall and stout plant with long, sawtooth-edged leaves that forms dense stands in lowland fens and around the margins of lakes. It is especially common in East Anglia where it was cut for thatching material because it was more flexible and durable than reed.

How to identify

The long, narrow, blade-like leaves of Great Fen-sedge can be recognised by their serrated edges. The tall, clump-forming plant produces flower heads of clusters of brown spikelets (containing the flowers).

Where to find it

Widespread but particularly common in eastern England.

When to find it

  • January
  • February
  • March
  • April
  • May
  • June
  • July
  • August
  • September
  • October
  • November
  • December

How can people help

Human activity, including the drainage of land for agriculture and development, has resulted in the disappearance of many of the UK's wetlands. The Wildlife Trusts are working closely with planners, developers and farmers to ensure our wetlands are protected and managed for the benefit of the plants and animals they hold. We have a vision of a 'Living Landscape': a network of habitats and wildlife corridors across town and country, which are good for both wildlife and people. You can support this greener vision for the future by joining your local Wildlife Trust.

Species information

Common name
Great Fen-sedge
Latin name
Cladium mariscus
Height: up to 2.5m
Conservation status