Answer: It's probably best in North Carolina in fertilize in spring and fall. I'd say after a two week period, you could apply the fertilizer to the weed-b-gone lawn. Also, for the best lawn, topdress the grass with 1" layer of compost in spring to feed the roots. Mow the lawn higher than normal (2 1/2" to 3") to shade out weeds and leave the grass clipping on the lawn as added fertilizer. Organic fertilizers are nice to use to build up root systems and help choke out weeds. Once the lawn to lush and filled in well, this should prevent any need for additional herbicides.
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