When dealing with grass in unwanted places, there are a number of options that you can try. You can use chemical sprays such as glysophate for the cracks in sidewalks, or you can till up grass in your garden to cultivate around your garden plants. But both solutions can be expensive. Instead, there are several inexpensive options that you can try at home. These options have the added advantage of being easy to use, as well.
Mix a solution of 1 part salt and 2 parts water. Pour this water over the grass. Grass will turn brown and die as it takes sodium up through the roots.
Mix a solution of vinegar and dish soap and pour over grass to kill it.
Pour boiling water over undesirable grass. This will temporarily boil grass. However, unless you remove the roots, grass will eventually grow back.
Break up ground with a garden rake and pull the roots of grass out of the ground. This method is known as grubbing.
Spread three to four layers of newspaper over grass. Wet newspaper with a garden hose, and cover with mulch. This will smother grass and allow you to plant whatever you want in its place.
Mow grass low to the ground. Cover with black landscaping plastic. This will kill grass by blocking air and light from getting to the grass.