How does fertilization of the lawn cooperate with appication of herbicide for weeds?

I understand that you dont want to overseed the lawn when you are trying to control weeds through herbicides , so since there isnt much of a window for doing this (in between pre-emergen in early Spring and Post Emergent in late Spring) , is it a good idea to apply fertilizer to the lawn?





and if so, how does this help or not help in killing the weeds (broadleaf or grassy) ???

How does fertilization of the lawn cooperate with appication of herbicide for weeds?
Feeding the lawn whilst trying to kill off broadleaf weeds will not help or hinder with killing them.





A 13.13.13. is simply a balanced feed, you could also use one with a higher nitrogen content.





The only minor benefit you would get is that the grass would grow quicker to colonise the spaces left by the dead weeds.





I am assuming that you talking about an established lawn where you are reseeding patches.