Doff Concentrated Path And Patio Weedkiller is a highly effective glyphosate based weedkiller. A systematic weedkiller for the control of annual and deep rooted perennial weeds such as grasses, docks, nettles, willowherb, dandelion and many more. One 80ml sachet can be diluted with water to treat over 25 square metres. This powerful weedkiller destroys most weeds down to the roots with a single application! Can also be used to stop cut trees and stumps from re-sprouting and to kill climbing ivy.