They are maple seedlings and they have come from a nearby parent tree. They are not the result of the lawn work. Just mow them and they'll go. They will not harm the lawn if mown now.

Good info. Feeding in May is perfect and not late at all. That is when everyone should do it - after the spring flush of natural, new growth is finished. Too many people force feed their lawns in March or April and literally exhaust the plant's stored resources. Weed-n-feed is very hard to apply properly, so most people don't get the full effect. What we suggest is to use a good fertilizer when you need that and spot spray with a targeted herbicide when you need that. Broadcasting herbicide over the entire lawn is seldom needed, although in your case it might have been a good idea. If you still have broadleaf weeds after the wnf app, then it's because you did not apply right. It's often a 2-person job to do it right. Cutting low is a problem. That opens the canopy to allow sunlight down to the soil where the weed seeds need it. Just let it grow back up. Set your mower height to the highest setting. Tall grass resists summer heat and drought better. Morph might have something to say about that. Don't try too hard to figure out your lawn type. Some people know exactly what they have. If you have a mix, that's good enough. I would have thought that a mix would include some Kentucky bluegrass. In full sun that grass tends to fill in thin spots and choke out weeds. It could be that watering is a problem in general. Are there times when you go 2-3 full weeks with no rain? Those could be a problem for a lawn that is used to getting rain for a day or two every week. We talk about deep and infrequent watering here. Deep mean 1 inch all at one time. Infrequent means once a week after temps get into the 90s and less and less often as it cools down. This type of watering almost prevents weeds because weed seed needs to be kept moist for a couple days to germinate. When you let the soil dry completely for several days, the new seeds cannot germinate.

They both look quite similar. Any "weed" killer containing 2,4,D and Dicambra should control the unwanted broad leafed plant, but taking a good, in depth look at the soil and making necessary corrections may limit future growth. The people at your local office of the Cornell Cooperative Extension Service will be able to give you a more positive identification. kimmq is kimmsr

What are you considering "the weed" in the picture. Is it the broadleaf plant or the yellow tipped grassy plant? The yellow tipped grass looks like the seed head on buffalo grass to me. If you are watering daily, stop that. Watering too frequently will turn a lawn yellow. Here's a picture from morpheuspa of his Kentucky bluegrass lawn versus the other KBG lawns in his neighborhood. He watered his once a week while the others watered every day. If you are currently watering every day, you'll have to wean it off of frequent watering to get up to deep and infrequent watering. I'll give you the deets on that if you want or you could look for 'deep and infrequent' in this forum.