Rock salt will kill grass and keep it away for years, according to SFGate. It is also a way to kill weeds in the yard.
Rock salt is a permanent way to rid a section of landscape of grass. By placing just a little over the area, the salt will leech into the ground and sterilize it.
This method will keep any vegetative growth from coming through the ground, whether it is grass, weeds or flowers.
Rock salt can be placed around pavers and borders. Another way to apply it is by mixing 1 cup of rock salt and 1 gallon of hot water in a sprayer.