I've been fighting it for a while and so far the only absolute way to get rid of it seems to be sell the property and move far away.
If you're not willing or able to move I read about this in the local paper, the Long Beach Press Telegram ( http://www.presstelegram.com ). This quote is taken from In Your Garden, by jchristensen@earthlink.net, on July 5, 2008. Ref: http://www.dailybulletin.com/inlandliving/ci_9789583
Sprays don't stop nutgrass, but this technique (plus your persistence and patience) will work. Remove as much of the weed as possible, apply lawn food, then cover the ground with several layers of landscape fabric, and cover it with chipped bark or mulch. Keep it there for at least a year to block out sunlight and starve the nutgrass to death while still permitting water and plant food in to nourish nearby desirable shrubbery. Nutgrass cannot grow through the fabric, but you'll need to make sure no sprouts sneak up around seams or edges or around the trunks of good plants; if so, that nasty nutgrass will take over again.
http://www.amdro.com/Image/index.html
Cyperus rotundus (coco-grass/Java grass/nut grass/purple nut sedge/red nut sedge)
how do i get rid of johnson grass in my lawn?
Miss Maudie's yard was plagued by crabgrass, Bermuda grass, and nut grass weeds.
Unfortunately, yes.
It is if you are a wombat.
Cut the effected grass
Miss Maudie hates nut grass because it is an invasive weed that spreads quickly and takes over gardens. Nut grass is difficult to control and can choke the roots of other plants, making it a nuisance for gardeners like Miss Maudie who take pride in their gardens.
Cyperus rotundus
Cyperus rotundus
use pesticide
Kora, Korai, Korai kilangu
You pull them out. Then add some weed control to the grass.