Answer: I'm guessing you used a non-selective vegetation killer rather than a selective herbicide on your lawn. (There are broadleaf herbicides that target only broadleaf weeds such as dandelions and leave grasses unharmed.) I'm afraid the grasses in the treated areas are dead and no amount of coaxing will make them come back to life. Dig or rake out the dead grass and reseed the bare areas. If you do it now in early spring, your lawn should look terrific by this summer.
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