Weed grass is grass growing anywhere you don't want it to grow such as in a flower bed. It can also be the wrong kind of grass growing in your lawn, such as crabgrass growing in a fescue or Bermudagrass lawn. There are several ways to kill weed grass, including manual and chemical methods such as pulling by hand or using mulch, cardboard or herbicide.
Loosen the soil around the grass by inserting a shovel or garden spade vertically in the soil around the grass.
Pull the grass, roots and stolons out of the ground by raking the ground over the weed with a garden rake.
Probe through the loose soil with your fingertips to find any remnants of roots or stolons left behind and pull them out. Any root fragments or stolons left behind can put forth new grass.
Observe the garden area and pull any grass weeds that reemerge. Grass weeds are easier to pull when they are young. Follow the new grass to the roots or stolons, then remove them from the ground with your fingers or a garden fork.
Place damp cardboard or five sheets of wet newspaper over your garden to block any light from reaching the grass on the soil. Leave the cardboard in place. Over time it will break down, and the nutrients will absorb back into the garden.
Cover the cardboard with a layer of much such as straw, pine straw or bark. This will help to choke out any weeds attempting to become established.
Observe the mulch and hand-pull any weeds that attempt to grow in the mulch.
Select a post-emergent herbicide formulated for lawn grass. Select a pre-mixed herbicide in a spray bottle to cut down on mixing, the cost of purchasing a spray applicator apparatus and possibility of skin contact with the herbicide.
Protect the desirable grass or plants near the grass weeds by covering them with a plastic dropcloth. Herbicide will kill any plant it touches.
Spray the herbicide onto the grass weed until the blades are covered with herbicide.
Wait for the grass and roots to die. Grass will turn brown and become brittle.
Pull the dead grass out of the ground using a garden fork.
About this Author
Tracy S. Morris has been a freelance writer since 2000. She has published two novels and numerous online articles. Her work has appeared in national magazines and newspapers, including "Ferrets," "CatFancy," "Lexington Herald Leader" and "The Tulsa World."