SBK Brushwood Killer Concentrate Kills root and weed Stops regrowth Treats up to 332m² Contains triclopyr Size: 1L Vitax Sbk Brushwood Weedkiller 1 Litre A soluble concentrate, SBK Brushwood Killer has been formulated not to harm grass but tackle tough weeds right at their roots to prevent re-growth. A foliar acting herbicide, SBK Brushwood Killer can be used for the control of nettles, docks, thistles and brambles. It can also be used on broom, gorse, non-crop areas and used to treat wood stumps in the autumn and winter.