True, their roots are damaging but the barrows are still standing. The thing that often damages more are the farmers with ploughing, leaving no barrier around the barrows. This has happened within the last 50 years. Some barrows by me are often "run over" by the tractor, the natural growth is either liberally dosed with herbicide or burnt.. Not to go on about wildflowers, but my picture on the right is one of Stoney Littleton in flower - thyme, oxeye daisy, ladies bedstraw, scabious and wild grasses - the last remnants of an old wildflower meadow maybe....