Pour boiling water over the leaves and stems of the weeds, taking care not to wet any adjacent grass. A solution of one part salt, eight parts hot water and a squirt of dish soap is an effective weed spray. Cover nearby grass and plants, and avoid saturating the soil.
Mix together in a large spray bottle 1 quart of white distilled vinegar, 1/4 cup of salt and 2 teaspoons of liquid dish detergent. Shake the mixture until well combined, and spray the weeds thoroughly. A small amount of the spray does not harm grass, but for more extensive spraying, cover surrounding grass and plants with newspapers.
To keep weeds from coming back, apply corn gluten meal to the area. The corn meal acts as a pre-emergent that suppresses weed seeds by preventing their germination.