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I recently filled in some low spots in my lawn with soil and seeded. The grass I planted has now sprouted a lot of (I think) crab grass. Do I need to rip up and re-seed? Or, would a simple chemical treatment work? It is pretty widespread in the areas I had new soil, so pulling it would be laborious but not impossible.

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I would wait until next spring an put down pre-emergent crabgrass herbicide. It will not affect perennial grasses.

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Very often the best tool to remove weed from your lawn is not to try to fight the weed, but to help the lawn grass to outperformance the weed.

I can personally confirm moving the lawn frequently and close to the ground effectively reduces the crap grass, because it is then left without any green parts.

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