I have heard that vinegar can be used to kill lawn weeds. Though vinegar is acidic, I don't think it would be very effective in controlling weeds, nor is it a legal herbicide. Therefore I would keep the vinegar in the kitchen and use a more conventional herbicide if necessary. The information given herein is supplied with the understanding that no discrimination is intended and no endorsement by the Purdue University Cooperative Extension Service is implied. Any person using products listed assumes full responsibility for their use in accordance with current direction of the manufacturer.
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