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I was hoping that dethatching and core aeration would serve to break up the chemical barrier. Also, I figured seed in the bottom of aeration holes would escape the herbicide, and germinate successfully. I was mostly right: the majority of the holes did sprout grass, but there are certain areas where broadleaf weeds took hold before grass could. Since I did not do the work myself, I can't say without doubt that seed got into every single hole, like it should have.
GLAN: did you ever try spring seeding after pre-emergence herbicide was applied?
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