See those boat shaped leaf tips? That is a trait of the poa family of grasses Poa that flowers and goes to seed this time of year is a trait of poa annua. Although it is a grass, most consider it an undesirable grass= weed.

thanks! any idea how to get rid of it?

It isn't easy, or cheap. Tenacity is pretty useful for damaging the growing plant, but as it's a prolific seeder and germinates in the late summer, a mid-August pre-emergent can help a lot.

Get rid of it? It's probably a wrap at this point. I don't know where you are but it will die off when it gets hot. You can pull it but you'll probably be fighting a losing battle. Use a pre-emergent next year to prevent it.

I used prodiamine in the early spring but I guess that was the wrong one.

Wrong time.

OK. Thanks. I'll put it down (prodiamine) again in mid August as you recommended.

You should bag clippings when seed heads are present. Also, just to clarify, you will still want to apply a pre-emergent in the spring.