How to Kill Water Grass Weeds
- 1). Slice the water grass at the root using a v-shaped weeding tool. Place the tool into the soil and push down and into the root.
- 2). Pull up the weed with the tool and discard it.
- 3). Repeat steps 1 and 2 to remove each water grass plant individually.
- 4). Spray the weeds with a selective crabgrass weed killer. These weed killers can be found at most hardware and home and garden stores. A selective weed killer is formulated to only kill the desired weed and not the surrounding grass.