It is kind of hard to tell exactly what you have other than the dandelions and little violets. You really need to give the lawn a good feeding to see what fills in.
I see a fair amount of thatch so when the companies start hanging things on your door, see if your budget will cover de-thatching. I would aerate the lawn too.
As for an herbicide? Pick up a a bag of Weed-N-Feed and apply at the rate recommended on the sack or take the first number in the NPK ratio, which is nitrogen, and apply at the rate of 1 pound of nitrogen per 1,000sf (Nitrogen is the first number in the three number sequence. A sack marked 22-10-10 or whatever has 22 percent of the sack as available nitrogen).
Now then. The Scotts program is more or less foolproof if you follow it but expensive, especially if you have a lot of lawn. The weed-n-feed product for $10 a sack at ACE or even sitting outside the drug store will work too.
Alternatively you could just feed the lawn and use an herbicide spray with 24D as the key ingredient. Weed B Gone is one such hose end sprayer product.
Mow tall and regularly. Your crabgrass pre-emergent can come with your next feeding if it is an issue for you.
As for the yew you trimmed. It may come back but you did kind of a butcher job on it. See what happens. You might pick up a book on pruning.
That is not crabgrass. (too early for crabgrass in Chicago anyways) Looks like some type of grass. I see some on my lawn too. I am not going to worry about it too much, but if you don't like it, pull it out.
Second picture looks like a weed. Weed-B-Gone will take care of it.
The grass could be reed canary grass... a super invasive grass who's seed could have blown in from, well anywhere. I just found a few spots I my own yard today.
thanx, guys. i just mowed again, and things don't look too bad now. so i am going to let it ride = a LOT of other more important things on my plate.
the yew (wth is a yew ?). yeah, i did a hack job on it. i wanted to leave room for it to grow out, and still not be too close to the drive. i am, again, going to let it ride. if by next year it isn't growing = out it comes.
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