Himalayan balsam (Impatiens balsamifera) at Parke, Bovey Tracey, Devon, an invasive species that is difficult to control and manage as its seed head explodes, spreading the seeds over a wide range

Himalayan balsam (Impatiens balsamifera) at Parke, Bovey Tracey, Devon, an invasive species that is difficult to control and manage as its seed head explodes, spreading the seeds over a wide range.