marketing blurb says prevents weeds for p to 3 months ... i used this last year on our drive spring 2016 and weeds did not appear again until 2017.
available to order now but In stock on June 8, 2017.
Weedol Pathclear 6 Tubes Plus 2 Free. Pack contains 8 tubes of liquid concentrate weedkiller which are designed to kill all weeds from your hard surfaces where you do not want any plants growing. It has a systemic action which will permeate the roots so that the weeds won't grow back. It also leaves a residual barrier that will prevent new weeds growing for up to 3 months.