Posted: 08/05/2014 at 10:17
Morning i found this on the net,as it seems this subject is often a problem, weedkiller 2U
Most weedkillers are based on the active ingredient glyphosate, with the exception of Scotts Weedol which is based on the active ingredient didquat. This is a fast acting weed killer, but it will not kill deep rooted perennial weeds such as docks, nettles etc. For this a glyphosate weedkiller is required.
So for a complete control weed killer, a glyphosate based weedkiller is the one to go for. This covers all the major brands such as Roundup, Pathclear and Bayer Super Strength. The key is how much active ingredient per Kg does the weedkiller have. For example Roundup has 120g of glyphosate Roundup Ultra 3000 has 360g, but Bayer Superstrength Glyphosate has a massive 680g! This makes this product the ideal tool for treating extemely tough woody weeds such as Rhododendron or Japanes knotweed, along with usual weedkilling of dandelions, docks and other run of the mill weeds. If you would like to view this product please click on the link below.
http://www.weedkiller2u.com/homepage-products/super-strength-glyphosate-6-sachet-pack.html i hope this helps Alan