Vitax SBK Brushwood Killer - 500ml is a tough weedkiller for brambles, thistles, nettles and tree stumps, but is safe enough to use near grass. It is suitable for use on tough weeds and hardwood saplings from May to October. From June to August it is ideal for use on woody weeds, and in Autumn and Winter it is ideal for treating tree stumps. The liquid formula is clear and comes in a 500ml size, making it easy to apply to the desired area.