Roundup XL systemic weedkillers kill from the inside out. This systemic weedkiller goes in through foliage and moves right down to the root tips to kill off the whole plant. Kills even the toughest weeds and leaves no harmful residues to allow for replanting. Children and pets need not be excluded from treated areas. Kills weeds, including tough, deep rooted and woody weeds. Kills brambles, thistles and nettles anywhere that they grow.