Rob2[quote]The most effective home-made weedkiller is a mixture of four cups of vinegar to half a cup of salt and a couple of teaspoons of washing-up liquid. When the salt is fully dissolved, just spray or wipe it on to broad-leaved weeds such as docks and ground elder. Unfortunately, it is lethal to all other plants around it as well. It works best in sunny conditions. [/quote]
Found here
It also notes
Gardeners have made their own weed controls for generations, but home-made herbicides and pesticides are illegal under current EU legislation.
But I won’t tell if you won’t…
I think you could prob dilute with water. Use a very cheap plastic sprayer, as the salt will knacker it after a few uses. Oh, and it’s smelly, so make it up in the garage or somewhere.
Not saying it’s better than RoundUp (etc). And it is more hassle. But our water comes from a well at the back of the house, so I’m wary of spraying chemicals about unnecessarily.
(Note for pedants: yes, I know salt [etc] is a chemical, But I reckon if I’m happy to put it on my dinner plate, I’m happy to put it on my garden).