By Phoebe Jobling A warning has been issued over an ‘exploding’ plant that spreads quickly across the UK and can harm the environment. The Himalayan balsam, a pretty pink plant from the Himalayas, is now found all over Britain and is one of the most ‘dangerous’ species. Known as ‘touch me not balsam’, this plant is causing problems for the environment and businesses in many parts of the UK. Each plant can produce more than 2,500 seeds which can stay alive for up to two to three years. When the seed pods are ready, they explode if touched, sending the seeds flying up to seven metres away. Exper…