Answer: What a quandry! If your lawn has more weeds than turfgrass, it really would be better to start all over again with a clean slate. That would include tilling up the soil, raking out the weeds, and reseeding the area. Failing that, you can use a broadleaf weed killer (which will not harm your lawn). The grassy weeds can be spot treated with glyphosate (which is a vegetation killer so any turf it contacts will die, as well). You will need to rake out the dead areas, work a little compost into the soil and then reseed. If you put your lawn on a regular watering, feeding and mowing schedule it will grow thick and lush enough to crowd out weeds. If you apply a pre emergence product in early spring of next year, before weed seeds germinate, you can stop crabgrass and other weeds from sprouting up next year. Good luck with your lawn.
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