Invasive Species

Rogue invasive non-native wetland plants:

  • Himalayan (or Indian) Balsam (Impatiens glandulifera)
  • Japanese Knotweed (Fallopia japonica)
  • Giant Hogweed (Heracleum mantegazzianum)
  • New Zealand Pigmyweed or Australian Swamp-stonecrop (Crassula helmsii)
  • Parrot’s Feather (Myriophyllum aquaticum)
  • Creeping Water-primrose (Ludwiga peploides)
  • Floating Pennywort (Hydrocotyle ranunculoides)
  • Water Fern (Azolla filiculoides)

Rogue invasive non-native wetland animals:

  • American Mink (Neovision vision)
  • American Signal Crayfish (Pacifastacus leniusculus)
  • Zander (Sander lucioperca)
  • Killer Shrimp (Dikerogammarus villosus)
  • Demon Shrimp (Dikerogammarus haemobaphes)
    First discovered in early October 2012 in the River Severn at Tewkesbury, Worcestershire. It was later found in the same month to be present in two canals in Worcestershire and the River Sowe in Warwickshire.

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