Question
I was wondering if you could answer this question for me.  I have recently planted about 850sq. feet of fescue in part of my back yard.  It looks nice.  In the other part of my yard I have a mixture of fescue and something else, I am not sure what else as it was planted before I moved in.  In this other section there is also this grass that will NOT die.  It is a very "clumpy" grass and grows much faster then the rest of the lawn.  When I mow, and I have to mow very short, it looks like I have killed the pain grass off, but with in one to two days it starts to come back.  When it comes back it is almost yellow with very thin blades coming up through the dead clump.  With in one to two weeks, it has become a very dark green with wide blades and has become very compact.  I let a small section of this grow for a month and I almost lost my dog.  It had gone to over a foot tall and had what looked almost like wheat stalks coming out.  I have asked some people about this and they say nutgrass, but I have seen pictures of it and mine does not have the yellow "flowers".  I live in the Southern New Mexico, which is a very dry climate.  The soil is mostly clay, though I have been working in lots of nice top soil and even plain sand.  I would like to keep the new grass looking nice and at some point I would even like for the rest of the lawn to do the same.  If you could help that would be great.  If you need any more information please email me.  Also if you would like a picture of the grass would help I can do that.  I just have to wait as I mowed last weekend and it is just now starting to grow into the pain in the grass again.
Thank you very much for your help.
Jason  

Answer
Jason,

There are several university sites set up to help ID weeds.  Yes, I would need to see the weed before I could ID it.  If you would like to send me some pictures that would help.  If not you may be able to search NMSU's website for their turf management website.  They should at least have links to a good one.  Another good place to check is Michigan State.  MSU has one of the premier turf management programs in the country.  

Once you have ID on the problem grass, control options can then be decided.  

I hope this helps.  Good Luck,

Thanks,

Turfnut2