On the longest day of 2026, four GoodGymers met Ben Morris and the other Balsam Bashers from Clean Up River Brent (CURB) for a biodiversity-boosting mission. It was only 10 am, but with the sun rising so early at this time of year, it already felt almost like afternoon.

Having defeated the invasive Himalayan balsam on the banks of the River Brent near the Brent Viaduct last summer, the next step was to build a fortress of native plants. Earlier this year, CURB had planted purple loosestrife and reeds ("the good guys") in the space reclaimed from Himalayan balsam ("the baddie"). However, much of the riverbank had since been occupied by a different gang: stinging nettles, cleavers and brambles.

With another delivery of reeds still on the way, our mission was to prepare the ground for future planting events. Cue hacking, slashing, lopping, chopping and digging.

Andrew, who fondly remembered his previous slashing mission with CURB, joined regulars Steph Ducat, Sevan and Kash. Armed with wellies, the four GoodGymers ventured down to the riverbank. Sevan and Kash even had the pleasure of dipping their booted feet into the cool river water - a welcome relief on such a hot and thirsty morning.

"Every minute a dive into the water gets more and more tempting!" – Andrew.
"I'd say have a swim, but I cannot say that." – Ben.
"You can swim as long as you're not getting in contact with the water." – Andrew.

Unfortunately, the River Brent isn't exactly a wild swimming destination. The water is known to be heavily polluted, containing sewage and harmful bacteria, making it far from safe for a dip. That's one of the reasons CURB exists. Alongside practical conservation work, the group monitors water quality, removes rubbish, raises awareness through public engagement, and campaigns against sewage pollution in the river system. We'd all love to see the Brent become a clean and thriving ecosystem once again. Encouragingly, a few volunteers spotted fish during the session, proving there is life in the river - but there's still plenty of work to do.

And so we got to work.

Steph wielded a monstrous slasher, mercilessly cutting back unwanted vegetation. Andrew took on the nettles and brambles with shears and a fork. Standing ankle-deep in the river, Sevan focused on the delicate task of rescuing the loosestrife and reeds by removing bindweed and nettles. Kash worked the slope between Steph's assault and Sevan's rescue mission, chopping back nettles and sticky willy.

At one point, alarm was raised when a couple towering hogweed plants were spotted rising above the surrounding vegetation. If you haven't encountered this particular baddie before, giant hogweed is a highly invasive species whose sap can cause severe burns when exposed to sunlight, leading to painful blisters and long-lasting skin damage. Fortunately, Ben confirmed that the plants in question were merely common hogweed rather than their far more sinister cousin, and the slashing could continue.

"These hogweeds are enormous... but not giant." – Sevan.

In a little under two hours of hard work in the sun, we cleared a significant area that is now nearly ready for planting. We left most of the roots for a less dry day, when they'll be easier to dig out. We're looking forward to hearing from Ben about the next delivery of plants so that we can arrange a follow-up session and cement our victory over the baddies by planting more of the good guys along the riverbank!