Quackgrass is a well known grass. The reason it is so prevalent, like crabgrass, is that it makes excellent forage for livestock. So while farmers and homeowners go around trying to kill it, ranchers are planting it or letting the native quack come in unhindered.
If you are serious about getting rid of it, next February, apply 40 pounds per 1,000 square feet of corn GLUTEN meal. Then follow that up again a month later. Quackgrass seed germinates in the early spring, so the CGM should keep it from sprouting and growing.
Also try to keep your lawn pretty dry between watering next spring. Don't water until your real grass starts to look dry. The soil might be dry for days before the grass looks bad. Then water for an hour or more all at once. I realize you have no control over rain, but do what you can to avoid seed sprouting conditions (continual moisture). And the other thing is to move your mower to the highest setting. Seeds need sunlight to sprout. You can deny sunlight with tall grass. If your grass is bermuda, you might not be able to avoid direct sunlight depending on how dense your bermuda is.
_________________ David Hall Moderator Dirt Doctor Lawns Forum
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