Invasive non-native species

There are many non-native species in our local environment.   

Some don’t cause harm but others – known as invasive non-native species - can threaten local biodiversity by outcompeting native species and spreading disease.   

There is concern the number and variety of non-native species in the UK will increase due to milder weather conditions. 

The most common non-native invasive species in Torfaen are Japanese Knotweed and Himalayan Balsam, both of which grow fast and shade out other plants.   

Other non-native species include Montbretia, Cherry Laurel and Cotoneaster.   

It is the landowners’ responsibility to treat or have treated invasive non-native species.  

Japanese Knotweed needs to be sprayed or stem-injected for a couple of years and can only be removed to a licensed site. 

It is an offence to plant invasive non-native species in the UK and carries a maximum penalty of £5,000 and or six months in prison. 

What we’re doing? 

• We have a programme for eradicating Japanese Knotweed on council land.
• When we get a report of an invasive non-native species, we assess the species and identify the best eradication technique.

How you can help

• Report any invasive non-native species via the INNS Mapper website or download the app.  
• Join a Blaenau Gwent and Torfaen Local Nature Partnership volunteer Himalayan Balsam pull. For more information, contact kristen.thobroe@torfaen.gov.uk  
• Don’t dump garden waste.  

Report issues with Japanese Knotweed

Useful information 

• Welsh Government advice on injurious and invasive non-native species
• The Great Britain Invasive Non-Native Species Strategy 2023 to 2030 (nonnativespecies.org)