Hundreds of people are expected to turn out to help pick weeds along the River Dee and its tributaries in north Wales.
Several organisations have united to arrange their own "Dee day invasion" which is targeting non-native species like Japanese knotweed.
There are 16 separate events tackling Himalayan balsam which has shallow roots and can be easily unearthed.
The project on Friday and Saturday brings together groups and volunteers from north Wales and Cheshire.
Big Dee Day: the Invasion is a fantastic opportunity for us all to make a really positive impact on the River Dee and our local environment”
It follows the annual Dee estuary clean-up which involves dozens of groups each September.
Events taking place including a Bala Balsam Bash in Gwynedd and a clean-up in Flint, while anglers from Wirral are holding their own work party at Carrog, near Corwen, Denbighshire.
Continue reading Weed picking: Big Dee Day Invasion on north Wales rivers
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