OCP Slasher Organic Weedkiller kills a broad range of weeds as well as moss, algae, and lichen. It is non-selective and works on contact to rapidly desiccate and burn weeds. Visible results are seen within 1 hour on most weeds. Use anywhere around the house including garden beds, veggie patches, paths and driveways. OCP Slasher Organic Weedkiller is glyphosate free.