Steps:
- Mark off two sections (2 ft. x 3 ft. each) of the garden-not touching any other plants in the garden
- Put 1 cup of vinegar in a spray bottle
- Spray all one cup in one of the sections marked off in the garden
- Water the other as usual
- Repeat steps 2-4 every other day for one week
- Record what percent of the square is consumed by living grass every time the vinegar half is sprayed