Distilled white vinegar is a natural alternative to harsh chemicals for killing unwanted grass in your yard. The vinegar has a high acidity level that kills the grass, but won't affect other plants or flowers in the surrounding area.
Killing the Grass
Treat unwanted grass with pure, undiluted white vinegar. Pour the vinegar directly on the grass, thoroughly saturating it. Alternatively, spray the vinegar onto the grass with a spray bottle.
Vinegar works best when you work in small areas. Apply the vinegar to one area of the grass and saturate that area completely before moving onto the next.
One treatment of white vinegar may not be strong enough to completely kill the grass. If you still see green grass in the following days, apply another dose of the vinegar. Continue treating the grass until the entire area dies.