Himalayan Balsam is an invasive weed from Asia which is spreading rapidly through Calderdale’s woodlands, open spaces and river banks. It’s also a serious threat to our native wildflowers and local ecology. Volunteer just a few hours and you could protect our local green spaces for years to come. So come along and join us in a bit of balsam bashing during our local balsam week from 19 to 26 July 2014!