Dual action formula kills existing weeds to the root and even prevents new weeds from growing for up to 4 months. Extended control ideal for large jobs. Use to kill and to pre-treat weed-prone areas such as driveway and sidewalk cracks. Up to 5 minutes ofcontinuous spray. No more trigger squeezing and no more aching back. No mixing, no mess. Active Ingredients: 2 percent Pelargonic acid; 1 percent Glyphosate; 0.017 percent Imazapic.