Japanese knotweed, giant hogweed and other invasive weeds

Japanese knotweed, giant hogweed and Himalayan balsam are the invasive weeds that your business is most likely to come into contact with, although there are several hundred others in the UK.

What are invasive weeds?

Giant hogweed Invasive weeds are not native to the UK and cause many problems. They can:

  • displace native UK species
  • reduce biodiversity
  • block footpaths, cycle paths and canal tow-paths
  • break up concrete and tarmac
  • damage flood defences and river bank stability
  • cause harm to human health (particularly giant hogweed).

These pages focus on Japanese knotweed, giant hogweed and Himalayan balsam.

In this guideline: