First of all, it's not a grass. It's a sedge. It's also not a broadleaf
weed, so broadleaf-specific herbicides won't be effective. Cyperus
esculentus and C. rotundus are both unique as sedges, because they're the
only ones that produce tubers, which makes them all the more difficult to
control. It's also a herbaceous perennial, so if you don't get the whole
plant (including the tubers), you'll see it again next season. Most likely
even more vigorous.

Toby said:

I have round uped it, Co Oped it, using 2 things the man sez it will take it
right out. Bull Snot it got it 50% of the grass/stems but no full kill.

How many applications of glyphosate did you do? How far apart were the
applications? Did you thoroughly irrigate 1 day before the application? Did
you irrigate again, two days later?

You won't kill it with one magic application. The best herbicides for it's
control, you can't purchase as a homeowner. Sucks, but that's the feds'
rules.

*****

Effective herbicides on yellow and purple nutsedges a

Pennant (metolachlor)
Basagran T/O (bentazon)
Image (imazaquin)
Roundup (glyphosate) [1]

Pennant is a preemergent, so that's out for now, but something to think
about for next spring.

Basagran T/O is a postemergent [2], and works best on yellow nutsedge.

Image is also a postemergent [3], and works best on purple nutsedge (you
didn't specify which).

Roundup (glyphosate) will work well also, much to your disbelief.

*****

For any of the above applications:

1. Make sure you THOROUGHLY read the ENTIRE label on the herbicide
container.

2. One day before you apply the herbicide, throughly irrigate the area to
be applied. Make sure you moisten the turf to a depth of at least 6 inches.
Check this with a soil probe, to be sure.

3. Treat the area with the PROPER rate of herbicide, according to the
recommendations on the label. If the temp is above 85 degrees Farenheit,
DON'T apply the herbicide.

4. Two days after the application, re-irrigate the areas to the same depth
as before.

5. One week after the application, repeat steps 2 thru 4. You may need
several applications to completely get rid of the nutsedge.

It also pulls very easily out of the ground, usually with the tubers
intact, unless it's a large, well-established patch (not first-season
plants). You'd be suprised how quickly an area can be cleared of nutsedge,
just by pulling it out.

If you can't/won't pull it, your best bet is probably using glyphosate.
Just watch your over-spray.

Notes:

[1]. If you can avoid buying the brand name "Roundup", do it. Look for
"glyphosate", it's the active ingredient. Scotts lost their patent, and
therefore their monopoly on glyphosate. The price difference is worth the
extra searching.

[2]. Requires the use of a crop oil (1.0% V/V).

[3]. Requires the use of a non-ionic surfactant (0.25% V/V).

HTH
--
Eggs

-A drunk man's words are a sober man's thoughts.