|Love this vinegar on my plants... in my kitchen.|
So here is the truth about vinegar as a weed killer. It does not work. Let me say that again; a thousand internet users can be and often are wrong. Vinegar is not an effective weed killer.
Grocery store vinegar is usually a 5% solution of acetic acid in water. A few vinegars may be a little higher percentage but still mild enough to dress a salad without gastrointestinal trauma.
Spraying vinegar on the leaves of a plant damages the foliage. If it is a small enough plant the vinegar might even kill the foliage. But vinegar spray won't kill the roots. If the root lives, the plant will grow back.
Dumping vinegar on a plant doesn't kill the plant either but it might harm the earthworms you want in your garden. And ultimately it just wastes perfectly good salad dressing.
Do yourself a favor and keep the vinegar out of the garden and try an effective weed killer instead... Perhaps a large dog, small child, chickens, etc. Or you could pull weeds, which I find very therapeutic. Or you can even smother them with newspaper, plastic, or cardboard.