Reed Sweet-grass

Glyceria maxima

  1. Wildlife
  2. Grasses
  3. Reed Sweet-grass


Reed Sweet-grass is a tall plant of shallow water and marshy ground, towering above other grasses and forming large patches around rivers, streams and ponds. It flowers between June and August. Although it can become invasive in some areas, large stands can provide good shelter for all kinds of wetland creatures.

How to identify

Reed Sweet-grass is a tall grass with large, loose flower heads that are much branched and have narrow spikelets containing the flowers. Its leaves are long and bright green.

Where to find it

Common in England, but rarer elsewhere.

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
Reed Sweet-grass
Latin name
Glyceria maxima
Height: up to 2.5m
Conservation status