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‘Balsam Blitz’ on River Brent, 31 May

River Brent at Perivale Park. See web link.
More information:

Join Thames21 and help remove a very invasive plant, Himalayan Balsam, from your local waterway, the River Brent, at Perivale Park. Himalayan Balsam takes over the riverbanks, not allowing other species to grow.

For more information see