The amount of bleach needed to kill grass will vary depending on the concentration of the bleach and the type of grass. For best results, use a concentrated bleach solution (6% sodium hypochlorite) and apply it directly to the grass. Be sure to wear gloves and eye protection when handling bleach.
Bleach can be used to spot-treat areas of unwanted grass, or it can be applied to an entire lawn. To spot-treat grass, mix one part bleach with ten parts water and apply it directly to the grass. To treat an entire lawn, mix one gallon of bleach with five gallons of water and apply it evenly over the lawn. Be sure to water the lawn thoroughly after applying bleach to help wash away any residual chemicals.
Bleach is a powerful chemical that can be harmful to humans and the environment if not used properly. Be sure to follow the safety instructions on the bleach bottle and dispose of any leftover bleach properly.