The rangers have a session on Holbrook Marsh every year to keep the invasive Himalayan Balsam in check. It's a great site for wildlife and an oasis that most people would pass without knowing it's there. The rangers will be on site for the whole of the session, but any help is welcome, so please feel free to come and go whenever suits you. I've set the terrain rating quite high if folks want to don wellies and work at the water's edge. However most areas are accessible in regular footwear if you prefer to keep on terra firma! I'll bring gloves and some refreshments, so you just wear appropriate clothing and footwear.