re: What is the best fertilizer for lawns right now?

Damn that stuff is not cheap but I was looking for a good fertilizer for my St. Aug, when is the latest you can spread the Lesco out? I was thinking about applying some Metsulfuron Methyl because I have some dollerweed and a few other weeds in my front yard mainly but I don't know if it's too late to spray that or if I should just go ahead and lay out the fertilizer.