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south central IOWA | Trimec label will say to wait until second mowing. Quinclorac is 28 days post emergence but not sure if it'll kill the weeds you have.
I did a little patch about the same time you did and the pennycress is thick as can be. Sprayed it with quinclorac thinking pennycress would be easy to kill. Turns out it doesn't even blink an eye at it. At this point I'm not spraying anything else on it. It's been frosted a couple times and anything that pops up next spring, you'll easily be able to kill.
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Spraying New Lawn
