In woodlands, rhododendrons grow to form such a dense layer of vegetation below the tree tops that they prevent ground level plants from growing and trees from regenerating as the seeds cannot penetrate the ground. Rhododendedrons also compromise efforts to create more open areas. They therefore need to be kept under control.
American Mink were introduced to the UK and bred because of their fur but after escaping into the wild, this species caused a huge amount of damage. One of the worst affected native species was the water vole - Britain’s fastest declining mammal. Their loss not only reduced the diversity of river bank vegetation but also resulted in a diminished food resource for raptors, pine martens and owls. Working with our partners we are helping to control American Mink numbers.