weed killer murdered my grass

jessie-pooMay 6, 2007

I used a weed killer of a reputable brand that advertised "wont kill your grass" well the weeds are all gone but now my grass is all brown and dead, and in other spots there were so many weeds that i have bare spots in between what little grass is left alive.

is there anything I can do for the brown grass.. will fertilizer magically bring it back to life?

and for the bare spots should i seed??

Im young this is my first lawn and im on a budget so re-sodding the whole yard is out of the question. is there anything i can do to save my little yard??


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Ouch, that hurts! If you fertilize now, I'd use Miracle Gro or something to give it a gentle boost instead of a Scotts' brand fertilizer. Alternately, Milorganite which is a little gentler.

Water might help, too...

Good luck!


    Bookmark   May 6, 2007 at 5:06PM
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Yeah, lots and lots of water to try leaching it past the root zone, but then you don't indicate when this happened. So, I don't know if it is already too late. There in Texas, it's possible you have St. Augustinegrass. Many labels say the product won't burn the lawn, but they also state not to use on St. Augustine or a certain variety of St. Augustine, like Floratam. Other than those, herbicides formulated for warm season grasses are usually pretty harmlesss to the other species. Ordinarily when this happens, the grass does survive and return at a later time. Yours being a warm season type, I can't speculate when that will be - this season or next year. Perhaps someone else will have a better guess. I'm sure you don't need me to say it but I'm gonna LOL. In the future, please read the whole label before applying and be sure to apply at recommended rates. More is not better.

Tell us what type of grass you have so someone can direct you in caring for it. There are different maintenance practices for almost all the different warm season type species, and proper care is your best hope for reviving it right now, even though it's brown.

    Bookmark   May 6, 2007 at 7:28PM
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theyardbird(z7 OK, TTTF)

Echoing what bestlawn has asked, what kind of grass do you have? And what specific weed killer did you use?

Here's a recent topic that might be relevant to this discussion: Fescue suddenly yellowing

    Bookmark   May 6, 2007 at 11:24PM
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The user caused the lawn to die. Not the weed killer. Take responsibility. Read directions.

    Bookmark   May 7, 2007 at 6:37AM
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gryd(Trumbull, CT Z6)

I no longer trust weed killers that supposedly won't harm grass. I burned up sections of my lawn last June with Weed be Gone because the weather turned warmer. I think the only way to use the stuff is when the soil is moist and the temps are cool. If its been hot and dry where you are I don't think the grass will come back. It didn't for me.

    Bookmark   May 7, 2007 at 8:25AM
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Unless a product is specifically labeled that it is safe for St. Augustine, it will likely kill the grass. Once St. Augustine is straw brown, it is dead. No amount of water or fertilizer will bring it back. This from a person that has a 50 year old organically maintained St. Augustine lawn.

    Bookmark   May 7, 2007 at 9:05AM
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I just used Ortho weed-be-gone MAX (the spray bottle that you connect to your hose). Spoke to a Scotts rep at Home Depot this past Satuday, and he told me how to use it all over my lawn. My main culprit was clover in mass quantities all over the lawn area. Sprayed it on, admittedly used the entire bottle on less than the recommended square footage of lawn area, but noticed the clover starting to wilt the next day. Will keep an eye on the clover and grass over the next couple days. BTW, I'm up in the NW suburbs of Boston, by Nashua. Hope this stuff works well. My neighbor spent $160 on a lawn co. to spray to kill his clover. Doing the job, but that's big bucks to spend for me. I need two more Ortho bottles to finishe my entire lawn area, and I'll have been out just $40.

    Bookmark   May 7, 2007 at 9:46AM
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Nashua NH is a suburb of boston now ?? lol i miss boston my hometown

    Bookmark   May 8, 2007 at 1:44AM
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urban sprawl has pretty much annexed much of southern NH along the Rtes 3/93/95 corridors as suburbs of Boston. I'm in Pepperell, MA, 10 minutes SW of Nashua, to be exact.

Back to the weed issue for a moment. I just finished spraying weed-be-gone MAX over the rest of my lawn area. And I did ID the weeds as white clover, not black medic, as I read about in another post. The clover is really wilting nicely. MY QUESTION is what exactly will happen to the dying clover?? Can I expect it to just die and remain visible on the lawn, or will it shrivel up and become less visible with the grass growing and being mowed all season long?

    Bookmark   May 8, 2007 at 7:52AM
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I'm the author of the linked thread above but I have good and bad news for you related to that.

The good: my lawn has almost 100% rebounded after the yellowing. However, I think I was lucky to get cool temps and a lot of rain in the days following the application.

The bad: I have fescue which is "safe" to use those products on and my grass merely turned yellow with little browning. If you do in fact have St. Augustine, I'm afraid your grass will not rebound this easily. :( Good luck!

    Bookmark   May 8, 2007 at 9:27AM
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"what exactly will happen to the dying clover?"

It will die. It'll get all twisty, then shrivel and turn brown. There will be bare spots where the clover used to be. If you have KBG, it'll spread to fill in those bare spots. If you have fescue, you'll need to overseed to get grass in those bare spots.

    Bookmark   May 8, 2007 at 10:14AM
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theyardbird(z7 OK, TTTF)


Whew! I'm glad to hear that your lawn rebounded.

    Bookmark   May 8, 2007 at 11:54AM
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Thanks, I'm sure most everyone can relate to the sick feeling in the pit of my stomach upon seeing that.

    Bookmark   May 8, 2007 at 12:58PM
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The weed killer i used is Bayer Advanced for southern lawns
it says for st Augustine &other southern lawns...

is it possible the grass got burned, we ahd a good rain (REALLY GOOD) a few days after but then it was hot..
so could the grass just be burned a little not dead..

    Bookmark   May 9, 2007 at 5:40PM
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But it also says not to use on Floratam variety of St. Augustine. What is your grass?

Yes, that is possible but we can't know the affect it had on the root system. This would determine whether it recovers and only knowing the variety will help with the answer. Normally, herbicides will not harm the grass types for which it is labeled. If over-applied, it might cause yellowing but that is temporary.

    Bookmark   May 9, 2007 at 7:22PM
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I used Weed-be-Gone and killed my St. Augustine grass just a couple of weeks ago too. Now my beautiful yard looks like hell. Large dried up spots. I'm so ashamed, I didn't read the label. Since it's my front yard, I can't wait until next season for nature to take its coarse, so I've spent the last couple of days installing plugs for instant results.

Weed Killer on my precious St Augustine grass... I'll never do that again!

    Bookmark   May 24, 2007 at 5:32AM
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Do you know what kind of grass it was?

Being in TX it is a good chance you had Saint Augustine. You cannot use any post emergence herbicide on Saint Augustine except Atrazine. All others will kill it that contain 2,4-D, MSMA, and Dicamba the most popular combination of herbicides.

If it was Saint Augustine, and you used something like Weed-b-Gone, your Saint Augustin Be-Gone, dead, and will not come back ever again no mater what you do.

    Bookmark   May 24, 2007 at 2:09PM
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frank1965(z8 NWLouisiana)

Apparently the U of Fl does not find that 2-4d damages SA and I have to agree, see below- spot sprayed misc weeds two weeks ago and the grass is fine- it got the dollarweed but is slow and hit or miss on the violets- However I would be cautious as usual in hot weather- probabaly will not be able to use it again til fall.

SpeedZoneƂ St. Augustine Formula is also unusual in containing the herbicide 2,4-D which was generally thought to be damaging to St. Augustinegrass. In the mid 1980s Dr. Wayne Currey, then turfgrass weed scientist for the University of Florida, observed considerable difference in the St. Augustinegrass injury among different phenoxy herbicide products. The differences were due to the concentration of herbicides other than 2,4-D, particularly mecoprop (once called MCPP), in the mixtures. From many experiments that I have performed in South Florida, mecoprop and not 2,4-D appears to be the killer of St. Augustinegrass. SpeedZoneƂ St. Augustine Formula contains a reduced concentration of mecoprop, and I have not seen injury to St. Augustinegrass from labeled rates applied at any season of the year.

Here is a link that might be useful: Broadleaf herbicides for St. Augustinegrass turf

    Bookmark   May 26, 2007 at 12:28AM
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I'm looking for a weed killer and i have St. Agustine grass, wich brand u recomend and where to buy it? I've been looking for SpeedZone and i can find it... Thanks for your help!!

    Bookmark   June 3, 2007 at 5:42PM
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frank1965(z8 NWLouisiana)

natalia, Does anyone carry Fertilome products in your area? Actually what I used is Fertilome Weed Free Zone which is the same formulation as Speedzone Southern and Speedzone St Augustine- just remember that it's getting hot right now.

Here is a link that might be useful: Weed Free Zone

    Bookmark   June 4, 2007 at 12:07AM
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njtea(NJ Z6)

I used the same product and followed the directions spot spraying the weeds. The grass is dead but I had to dig the weeds out because they were still flourishing, then I spot reseeded.

Took the product back to the store where I got it and got a refund.

    Bookmark   May 23, 2008 at 12:32PM
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I'm in north Florida and just did the same thing. I used bayer advanced for southern lawns. Said its for st. Augustine and other southern lawns. Well it killed my st Augustine. Didn't kill the centipede. i may have applied it too late in the year? it was pretty hot, but applied in the evening while it was cool. Anyways, I wonder if it will come back next season????

    Bookmark   August 24, 2013 at 10:16AM
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dchall_san_antonio(8 San Antonio)

You can speed up the return with a few flats of new grass. It will cost you a little more than a dollar per flat but they spread very well in the fall and spring.

I'd like to see a picture where the centipede was spared and the St Augustine was killed. Can you post one?

    Bookmark   August 24, 2013 at 3:24PM
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