posted 7 years ago
If you have any Bermuda in that mix, the runners are the main way these spread, they can choke out some plants if enough of the runners get around the base of the plants.
Most grasses, as Casie brought up, can be subdued by covering with something to smother them down and keep light off them for a full growing season.
Keep in mind that grasses actually do a good job of; sequestering carbon, holding soil in place and adding humus to the soil.
Unless you just have to have the grasses gone, you might just keep it trimmed short and use the cut blades as fresh mulch, that will put the nitrogen and other minerals held in those blades back into the soil.