Grass is not always a welcome plant. If it grows in an area where it isn't welcome, such as a garden, past the edges of the lawn or in between stones of a walkway, then you need to remove it to improve the look of your overall yard. To do this, you could by expensive chemicals, or you could use some more natural remedies that are safer for animals and people.
Fill the landscape sprayer with white vinegar. Seal the can tight.
Spray the grass area that you want to kill, making sure to avoid the plants that you want to survive. Wait a few days to see if the grass is dying. .
Spray a second time if all the grass didn't die. Add a few tablespoons of salt to the vinegar. The salt will make the soil uninhabitable to the grass, and it will die.
Cover the grass kill area with dark plastic to keep light from getting to the site and encouraging regrowth. Leave the plastic in place for several days. Use heavy objects such as rocks to hold the plastic in place.
Rinse the sprayer out and fill it with water and several tablespoons of baking soda. Spray the grass kill area with the mix before you try to plant anything new. The baking soda will help restore the ph balance of the soil so that things can grow.