Now weâre talking.
Ok, that sounds logical if rather depressing!
Just for one day, can you stop posting random shit youâve googled everywhere?
It seems the go-to weedkiller for mareâs tail used to be glufosinate, but that was banned in Jan this year. This stuff now claims to be the best replacement https://www.progreen.co.uk/kurtail-evo-mares-tail-weed-killer. Itâs basically glyphosate combined with another compound designed to force the glyphosate into the plant. The same formulation but with a different brand name - Diamond - is available on eBay for three times the price. Itâs not meant to be used by amateurs.
Although glufosinate is banned there are still ads for it on Alibaba. Not that anyone would be thinking of using it here. Oh no.
VB
If @stu had had a lawn of that he wouldnât have had to go plastic.
I have looked at Kurtail, it costs something like ÂŁ50 for under half a litre and canât be bought without a license. I know someone who would get it for me and would be happy to pay the price but, they are very cagey about itâs efficacy, no guarantees.
I can send a few cuttings 
Could the problem be that treatment which was only partially effective will have shrunk the foliage above ground but not properly restricted the rhizome growth below ? If so then youâd be trying to poison a fuckton of buried trouble and the only way in would be through a few spindly leaves on the surface. Sadly the leaves could be fried long before the rhizomes can ingest enough poison to kill them. Options then could be i) digging as much of the rhizome out as possible and using poison to deal with the plants that pop up from the bits that are left or ii) letting the stuff above ground grow really big before you hit it with a great deal of poison. Maybe itâs time for pro help from people whoâve learned their way up this curve ?
VB
The whole garden, 80M x 8M is affected and apparently the roots reach 2M deep, and gardens either side are similarly affected. So to sum up, I think weâre fuct 
This is what comes of neglecting the wholesome pleasures of basic garden maintenance for the cheap thrill of the bi-monthly overseas package holiday.
No.
What, no google response?
Disappoint.
Heâs waiting 'til your guardâs down.
VB
Well, at least heâs stopped for now. 
Do you name all of your plants? 
I have a cabbage called JB.