Question
how do we get rid of the nut grass and some other grass and to have our back yard the zoyia only.  There are some weeds not many, mostly the nut grass we have pulled and pulled but the nut grass is not dying out.

Answer
Hi Don,

I was going to type out a big long answer, but one of my own favorite sources for new information appears to already have answered this pretty well. No need to reinvent the wheel right? Check out the following link.

http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7432.html

Let me know if you have any other questions!

-C.J. Brown
www.TheLawnCoach.com