In organic gardening, vinegar can function as a natural weed killer since the ​acetic acid in vinegar gives them the power to kill weed. The higher the acetic acid percentage, the deadlier it will be. You'll need to buy horticultural products with a higher acetic acid content which are available at garden supply and home improvement stores. A commercial weed killer is usually effective after one or two tries because it's absorbed by the weed, reaching the root to permanently kill it off. Vinegar typically does topical damage to the weed unless you can apply it directly to the roots.

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Source: The Spruce