The Roundup concentrate weedkiller is for use on unwanted vegetation and areas such as hard surfaces including drives, patios, paths, tarmac, gravel and paving not intended to bear vegetation. Always apply roundup between May and September to an actively growing lawn before the onset of dormancy. The solution gets degraded into the soil by the microorganisms, killing the roots so, weeds don't come back and removing dying and dead lawns. The liquid usually takes 7 to 10 days to translocate to the roots of the treated lawn. This pack treats up to 420m². Banish unwanted weeds from hard surfaces like drives, patios, paths, tarmac, gravel, and paving with this effective weedkiller concentrate. Apply between May and September to actively growing weeds before dormancy for best results. The solution translocates to the roots within 7 to 10 days, killing weeds to the root and preventing regrowth, even clearing dead or dying lawn areas. The solution is degraded in the soil by microorganisms. Tough weedkiller - Eliminate tough weeds and unwanted vegetation quickly and effectively. Specially formulated for maximum absorption, it kills weeds right down to the root, preventing regrowth and maintaining a weed-free garden. Fast acting formula contains 170 g/L glyphosate acid (present as 208 g/L potassium salt of glyphosate), ensuring fast and powerful weed control. Ideal for treating weeds in difficult areas, such as beds borders, vegetable patches, flower pots and in hedges. Controls most weeds around the garden, e.g. gravel areas, paths.