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  Sean Graham November 3, 2016 at 11:49am

  The weedkiller for mares tail is called Kurtail, Progreen do it but no doubt others as well. Too late now, you will have to hit it in the spring.
  You shouldn't need weed control fabric under well laid slabs.
• PRO Supplier

  Progreen Weed Control November 3, 2016 at 4:55pm

  Kurtail / Kurtail Gold has been around the longest and is a proven product on horsetail (equisetum arvense). It needs no bruising or bashing about before spraying but will likely need re-treatment a few times - depending how infested it is. If you are chopping down into the soil you risk root disturbance and awakening the beast as it will try to grow back twice as much as before once spring hits...

  Weed membrane will not stop it growing through at all - it pops up through tarmac and weak paving joints..! Solid concrete will hold it back but you will need strong, full mortar pointing - not engineered sand or or brush in stuff....even then I would expect it to poke through after a while or seek out weak spots...any chance of preparing a solid 2-3"concrete bed for the slabs?

  Happy to chat if you want talk through other options..?

  Richard@Progreen

  (01778) 394052
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  Jeff McCoy November 3, 2016 at 8:13pm

  A friends dad now in his 80, s told me about going to the local Gasworks in Belfast and collecting a container of Gas water. Apparently they bubbled the gas through this water to remove impurities. When put on a path or gravel no weeds for years to come. It does go to show, health and safety in the workplace has moved on a bit.
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  David Daniels November 5, 2016 at 10:43am

  Try a systemic chemical herbicide, such as gallop which will kill the roots aswell.