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crab grass takeover of prairie plot

18 years ago

Last Winter, I planted grasses/prairie mix (~60/40)over snow-covered bare soil; grasses = Schizachyrium scoparium, Bouteloua curtipendula (from Stock Seed Farm). I prepped last fall by spraying w/ glyphosate and raking 2X.

This summer, the plot is overrun w/ crabgrass. There are forbs, but no indication of LBS or SOG. I have mowed over the top twice. Do I kill off and start over or what? Please advise.

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