Round Up vs Vinegar
I have a handwritten note in my garden records that says Organic Round Up alternative--20% vinegar.
Although I don't recall the origin of this recipe, I do remember going to every Agway and store around me looking for 20% vinegar without success.
A few questions:
Does it work?
Is readily available 5% effective, even if it takes longer and more applications?
Would boiling down the 5% produce a 20% concentration?