Non-native Species: Weed Control

Defra recognises the impacts caused by invasive non-native plant species (INNPs), including Japanese knotweed. Japanese knotweed is listed on Schedule 9 of the Wildlife and Countryside Act 1981. This makes it an offence to cause Japanese knotweed to grow in the wild.

In England, the Government has developed guidance on treating and disposing of Japanese knotweed, which can be found on GOV.UK: How to stop Japanese knotweed from spreading - GOV.UK. Guidance is also available on treating and disposing other INNPs, which can be found on GOV.UK: How to stop invasive non-native plants from spreading - GOV.UK.

In partnership with the Welsh Government and Natural England, Defra is funding the Centre for Agriculture and Bioscience International (CABI) to conduct biological control (biocontrol) research into the use of living organisms as a cost and time-effective way of managing INNPs. This research has identified the psyllid (Aphalari itadori) as a biocontrol agent for tackling Japanese knotweed. Further information can be found on CABI’s website: Japanese knotweed - CABI.org.

Defra is providing funding for land managers to control and manage INNPs through the Environmental Land Management (ELM) Countryside Stewardship scheme. Further information can be found on GOV.UK: Countryside Stewardship Higher Tier - GOV.UK.