Join a balsam hunt and water quality testing session on the Thames
4 July 2026 · By Boroughly editorial — AI-assisted, human-reviewed.
Habitats & Heritage and the Thames Landscape Strategy are inviting residents to get hands-on with local conservation in Twickenham, pulling invasive Himalayan balsam and testing the water quality of the Thames.
Himalayan balsam is one of Britain's most prolific invasive plants. It spreads rapidly along riverbanks, outcompeting native species and leaving riverbanks exposed to erosion once it dies back each winter. Removing it by hand — which is straightforward once you know what you are looking for — is one of the most effective ways local volunteers can support native plant recovery and improve wildlife habitats along this stretch of the Thames.
The session also includes water quality testing, giving participants a practical introduction to how the health of the river is monitored and what the results mean for local ecology.
Organisers ask that participants wear long-sleeved tops and trousers and bring sturdy shoes. Sun cream, a hat and plenty of water are also recommended — there will be a fair amount of walking, bending and standing throughout the session.
The event is listed as evergreen, so check the Richmond Council events page for confirmed dates and any booking requirements before heading along.