Tweed Invasives Project

The Tweed Invasives Project started in 2002, when many stakeholders identified Giant Hogweed as one of the biggest threats to the River Tweed. With prolonged control of target non-native plant species, the Tweed Invasives Project is one of the UK’s largest and most successful control programmes. Whilst control of Giant Hogweed and Japanese Knotweed extends throughout the Tweed Catchment, the Project expanded to include Himalayan Balsam within the Till sub-catchment in 2005. A brief history of the Project is available here.

Target Species
Giant Hogweed (click here for ID sheet)


Japanese Knotweed  (click here for ID sheet)

Himalayan Balsam (click here for ID sheet)

If you think you have seen one of these species or you need more information, please email us on giving your name, contact number, the exact location of which species and the date seen.

Find out how we are tackling each of these species below:
Giant Hogweed
Japanese Knotweed
American Skunk Cabbage
Himalayan Balsam

Click here to find out how the project is progressing.

A brief history of the project is available here, a more comprehensive review is available in Tweed Invasives Project: A Case Study.

The Tweed Invasives Project is an integral part of the Tweed Catchment Bio-Security Planning Initiative (you can download the plan below).  As part of our Bio-Security planning we share information with the Tweed Foundation, who act on reports of invasive aquatic animal species within the catchment. You can report a sighting of an invasive aquatic animal, such as American signal crayfish, to the Foundation using this link

Tweed Catchment Bio-Security Plan (Plan, 2011-2016)
- Controlling Invasive Plants in the Tweed Catchment (Leaflet, 2014)
- Tweed Invasives Project: Summary Report (2016)
- Assessment of Impact of Long Term Control of Invasive Non-native Riparian Plants in the Tweed Catchment and Restoration of Native Biodiversity (Report, 2013)
- Tweed Invasives Project: A photographic record of progress between 2004 and 2009 (Photo Report, 2009)
- Tweed Invasives Project:  A case study of the Tweed and practical steps to establishing and delivering a successful, long-term control strategy (Report, 2006)

Other useful links

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