Many weed killer chemicals that you can purchase at your local home and garden retailer can sometimes damage surrounding areas of grass. If you're concerned with the effect of the chemicals on your grass, the environment or pets in the area, consider creating a homemade weed killer. Many homemade methods for killing weeds will directly kill the roots of the weeds and not spread to grass or your garden area. Also, it's important to use homemade combinations that are safe and won't destroy your yard.
Heat water in a kettle on your stove and bring it to a boil. It's most efficient to try using boiling water to kill the weeds first.
Pour the boiling water slowly over the area of weeds, and make sure not to spread the water into grass that you don't want killed. The boiling water is safe for surrounding grass and plants, but quickly kills any plants it comes in contact with.
Add 1 quart of white distilled vinegar, 2 tsp. of liquid dish detergent and ¼ cup of salt to a large spray bottle. Shake the mixture so that it is combined well.
Lay down newspaper surrounding the weeds to protect other plants. If a little bit of the solution gets into your grass it won't harm the grass.
Spray the weeds the thoroughly and continue applying applications of the homemade weed killer for the following weeks until the weeds are fully eliminated. Pull out any remaining dead weeds with your hands and wear protective gloves.
Spread corn meal over the area as a pre-emergent weed killer. The corn meal won't affect surrounding grass, but rather, it will help prevent the weeds from growing back.