There are a few ways that you can get rid of grass in your lawn without using any chemicals. One way is to simply pull the grass up by hand. This is the most labor intensive method, but it is also the most effective. Another way is to use a weed whacker or similar tool to cut the grass down close to the ground. This will kill the grass and prevent it from growing back. Finally, you can use a lawn mower with a blade attachment to chop up the grass and make it easier to remove.