Answer: What you refer to as nutgrass is actually yellow nutsedge (Cyperus esculentus), which may be the worst weed in Chapel Hills. It is easily identifiable by its shiny leaf blades and hard, nutlike underground tubers. Complete eradication may not be possible, but there are some anti-nutsedge chemical products available at nurseries.
Make sure you follow label instructions precisely. For more thorough control, you may wish to consult with a horticultural pest control company, which you can find either in the Yellow Pages or on the Internet.
Best wishes with your lawn!
Q&A Library Searching Tips