Coco grass (Nut grass)
 

I have a problem with Coco grass, also heard it called nut grass. It seems
to like sandy soil and may (probably) came in with sand when we built our
house slab. I have some flowers growing in some rudimentary flowerbeds and
the Coco grass is a major pest. I pull it by hand, but just as much keeps
coming back..Any ideas, or if I keep pulling, will I win?
Perry
Thanks.