Assuming the initial flush of new growth has slowed down, then yes, you can fertilize now. My fertilizer preferences are all organic. Any organic is fine. Someone else will have to help with chemical fertilizer suggestions.

"...not looking for an immaculate lawn." To me that means you are good with the poa annua. Kids can play in that all day long. It tends to thin out in the summer heat, but comes back from seed every spring.

Most people seem to have bad luck with weed-n-feed. I believe this is because the directions for application are different from every other product. WnF goes onto wet grass. If the wet grass dries out in front of you before you get the spreader over the whole thing, then you lose the benefit of the herbicide. It is better to apply a normal fertilizer and, two weeks later, spot spray the individual weeds with the appropriate herbicide. To kill the dandelions and clover type plants, use something like Weed-B-Gone or Weed-B-Gone Clover, Chickweed, and Oxalis killer. To kill grassy weeds like poa annua, you'll need a grass killer. Grass killers will kill your grass, too, so there you go. Tough love. But the poa annua seed already dropped this year will be back next year, so prepare for a multi year attack.

Here a link to the video I just shot this afternoon.

Here is a link that might be useful: my lawn

I apply NPK by June 1 and Sept 1st. It helps my lawn prepare for the summer and winter respectively. If I can't find a 3-1-2 ratio I use a triple NPK. I agree, forget the weed and feed and stick with the Ortho products and separate fertilization.
Go heavy organic during the summer. Milorganite, or alphalfa.
An end of summer (end of July and again in September) prodiamine application and overseeding in March/early April (skip the Spring pre-m) can help combat the poa annua.
Winterize. Winterize. Winterize!

This post was edited by yardtractor1 on Wed, May 21, 14 at 14:28

what do you mean by triple NPK?

Bags of "triple NPK" contain equal percentages of nitrogen, phosphorus and potassium. Common available mixtures: 10-10-10, 12-12-12 and 19-19-19.

If you want to fertilize your cool season grass during the summer, use a low nitrogen content like a 15-3-7 with organic. You can also use Milorganite at the higher rate with very good results.

Bs milorganite by itself enough? Because that's what I bought today.