You got it. Yellow Nutsedge. The giveaway, other than the flower, is the triangular flower stem.

I've got it as well, and I pull up at least a thousand new shoots every year in just a small area.

I also have a 24" pot full of it, because I really like the look of the plant. It really doesn't spread by seed much, but the little 'nuts' on the roots are deadly! You can't get them all when pulling the plant, and one of those nuts will turn into a plant in short order. Fortunately, it's easy to ID and easy to pull.

funny you said you kept some - the reason I never pulled it is that I really liked the look and texture. If you are sure that it won't spread from a pot, I might do the same. It would look nice next to the Lemon Grass that I have in a pot on the deck. You're sure it won't spread from that big seedhead?
Looks like I have some weed pulling to do tomorrow! Now I will admit that I transplanted two patches of it when I thought it was something I planted...whoops!

It can self-seed, but conditions need to be perfect. I've seen no incidence of it in my zone, so it isn't likely in yours.

That said, I deadhead my potted plants, just to be sure. The flower heads get raggedy looking after the summer anyway.

WOW Donn - today was nutsedge removal day and i have never seen such a mat of white roots under there! I will always have this weed I fear - any suggestions on getting rid of it? I tried to comb through the soil, but you are right, I will never get all those white thready things out! How in the heck did I get this terrible thing? I was going to keep some in a pot, but trying to remove all that stuff kind of got me aggravated at the plant so I put it all in the lawn bags! ha

Hmmm, I have this as well. Had no idea what it was.
I just keep mowing it over and hoping it won't
come back. I hate to round-up a spot in the grass
just to kill one weed.

mary
z 5b KS

There is a product called IMAGE that will kill nutsedge in your lawn. I've used it successfully and so have my folks. You must follow the instructions on the label exactly, though, or you could harm your desirable lawn grass. It is safe to use around most ornamentals, which means you can apply it to nutsedge in your flower beds. However, there are some ornamentals that this product will kill - those plants which can be harmed are listed on the label, so if you use this product make sure to read and follow the directions to the letter.

To be honest, I don't think nutsedge is all that bad. My bugger is Bahia grass! Now there is a grass that'd survive a nuclear explosion. If anyone knows how to get rid of that stuff permanently, please do tell.

Renee