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Best way to kill nutsedge

2,640 Views | 35 Replies | Last: 8 days ago by cevans_40
aggiebrother33
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What's the go to for killing this monster weed in flour beds, that would be safe for dogs to walk on? It's taken over bad this summer and tried pulling all I can but I need to spray now. Worried about what would be bad for the pup, but also effective. TIA
OasisMan
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AG
I just Chat'ted this a couple weeks ago

It recommended:
https://a.co/d/0g5mbgwi

Said don't pull it,
Expect slow results, over a few weeks,
May need a 2nd treatment several weeks later
Mas89
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AG
Sedge Hammer
S.A. Aggie
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AG
If you're wanting something that's pet friendly you can use orange oil and vinegar.
hhttps://www.gardenstylesanantonio.com/garden-articles/orange-oil-vinegar-and-dish-soap-the-natural-herbicide/
Ag by Association
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S.A. Aggie said:

If you're wanting something that's pet friendship you can use orange oil and vinegar.
https://www.amazon.com/gp/aw/d/B07K7VCYMT/?_encoding=UTF8&pd_rd_plhdr=t&aaxitk=87f0756f1e220d227b8d6551dcfe87f4&hsa_cr_id=0&qid=1789342424&sr=1-1-3c6b3b04-89d4-46ee-857c-1e2f0de6a70e&i=aps&aref=VnjreWD3AC&ref_=sbx_s_sparkle_sbtcm_asin_0_img&pd_rd_w=w73xJ&content-id=amzn1.sym.aed14a85-9b2a-4580-93cd-aeafc2e15433%3Aamzn1.sym.aed14a85-9b2a-4580-93cd-aeafc2e15433&pf_rd_p=aed14a85-9b2a-4580-93cd-aeafc2e15433&pf_rd_r=1159ZXD2WJDBVRY5CJN6&pd_rd_wg=twtm2&pd_rd_r=630ada15-c7e5-4033-ab47-093e22165b3b

This great for weeds, but it will also kill the grasses you want to stick around...
Deerdude
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I had pretty good results with SedgeHammer but two sprays wasn't enough. You basically got to keep treating
cevans_40
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AG
Monument is the best thing available. Use a surfactant and be patient. Also look into freehand if you are just worried about your beds. Both of these products are expensive but they actually work. Freehand is a preemergent and monument is a post.
HTownAg98
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I've had very good luck with Image, and you can find it everywhere. The key is you have to water it in after spraying, because it works via root uptake. Most people forget that part, and then wonder why it didn't work as well as it should have.
docb
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AG

Spore Ag
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Can you paint stem with remedy and diesel. Just happen to have it.
S.A. Aggie
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AG
I pasted the wrong link.
schmellba99
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Certainty, or Sertay (generic form).

Sedge Hammer has never done anything for me - yellows it up a bit, but even after several treatments the sedge is still there. Certainty nukes it in 2 treatments, sometimes only 1. But once you get nutsedge, it's damn near impossible to get rid of outside of stripping the top 6" of topsoil and sifting it all out to get every single nut out of the ground. Even leaving 1 will screw you over in a short time frame.
Animal
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I've had great results with Dismiss without harming my Bermuda
mwlkr
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MSMA.
Leggo My Elko
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Sledge hammer (will usually take several applications over 4-5 weeks), but you will notice it getting weaker after the first application.

DO NOT PULL IT, you just make it stronger.
HTownAg98
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mwlkr said:

MSMA.

MSMA is not labeled for residential lawns anymore. Not saying it won't work on it, and if it's not on the label I won't recommend it, but if you just happen to have an old label, I'm guessing it would work. The only problem with MSMA is that it can be hard on bermudagrass at higher rates, and you shouldn't use it at all on St. Augustine.
IslandAg76
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AG
If you dig down on the nutsedge you can see the "nut" and there are runners going from plant to plant. If you don't get the "nut" you are essentially just pruning it and it comes back stronger
docb
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AG
HTownAg98 said:

mwlkr said:

MSMA.

MSMA is not labeled for residential lawns anymore. Not saying it won't work on it, and if it's not on the label I won't recommend it, but if you just happen to have an old label, I'm guessing it would work. The only problem with MSMA is that it can be hard on bermudagrass at higher rates, and you shouldn't use it at all on St. Augustine.

I still use MSMA on my zyosia and i use it previously on my bermuda at my previous house. I know it is not for residential use now but it is the only thing I have found that will actually kill dallisgrass. It can still be used on golf courses and public parks so honestly how bad can it be to be used in your lawn twice a year? It is easy to obtain as well.

As far as the OP really no need for a selective herbicide in the flower bed. Round up type Home Depot brands are just not what they used to be. Got to go a higher concentration if you really want it to work.
IslandAg76
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AG
I too have a great growth of this crap weed.
In a bed that also has roses and Plumeria.
Any of these products usable here?
schmellba99
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AG
MSMA works great for knocking out Bahia grass. It will yellow up bermuda some, but I've never had an issue with it killing it even when I stopped the tractor and forgot to turn the sprayer off - it burned a nice strip in the grass, but about a month later you couldn't tell where it happened.

I need something that will destroy crabgrass. I have a mess of it in my yard and so far nothing I've tried has actually worked.
aggiebrother33
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Thanks everyone! I opted for the "pet safe" natural armor version first due to my GSP lizard hunting 24/7 in the flower beds. Will post an update here if it works.
aggiebrother33
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schmellba99 said:

MSMA works great for knocking out Bahia grass. It will yellow up bermuda some, but I've never had an issue with it killing it even when I stopped the tractor and forgot to turn the sprayer off - it burned a nice strip in the grass, but about a month later you couldn't tell where it happened.

I need something that will destroy crabgrass. I have a mess of it in my yard and so far nothing I've tried has actually worked.


I put this down a couple years ago when I had it thick one summer, kept repeating and have zero crabgrass now. It got thinner each year and finally is gone. Really helped the Johnson grass that my neighbor has a bunch of. My yard I am super happy with it's the stupid flower beds and rocks I have around my firepit that have gone crazy with the nutsedge. Tried a propane torch and just came back stronger…

https://www.homedepot.com/pep/Scotts-Halts-Crabgrass-and-Grassy-Weed-Preventer-10-06-lbs-5-000-sq-ft-For-Use-on-Lawns-Also-Prevents-Henbit-and-Chickweed-44990A/204867898?source=shoppingads&locale=en-US&fp=ggl&pla=&mtc=SHOPPING-BF-CDP-GGL-D28O-028_002_FERTILIZERS-NA-NA-NA-PMAX-NA-NA-NA-NA-NBR-NA-NA-NA-PMAXONECLICK_JControl24&cm_mmc=SHOPPING-BF-CDP-GGL-D28O-028_002_FERTILIZERS-NA-NA-NA-PMAX-NA-NA-NA-NA-NBR-NA-NA-NA-PMAXONECLICK_JControl24-20410423155--&gclsrc=aw.ds&gad_source=1&gad_campaignid=20278987632&gbraid=0AAAAADq61UctReIJknO3xzswuV4Kh6QzE&gclid=EAIaIQobChMIiefPhunulgMVX29_AB0j3gDQEAQYASACEgKUK_D_BwE

DimeBox17
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AG
Used sedge hammer two years ago on a pretty big patch of it in my backyard and I haven't seen it come back since. I applied probably more than I should have so it knocked the Bermuda back as well. The pictures are before and after with a month in between the two.

EMY92
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AG
I killed a patch in my backyard earlier this summer. I picked up a bottle of Image at Home Depot and sprayed the area every Saturday for 4 weeks. Each week it looked worse. It has remained dead for the past 2 months, so hopefully that's the last of it. I have tried Sedgehammer in the past, but probably needed to hit it multiple times.
HTownAg98
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docb said:

HTownAg98 said:

mwlkr said:

MSMA.

MSMA is not labeled for residential lawns anymore. Not saying it won't work on it, and if it's not on the label I won't recommend it, but if you just happen to have an old label, I'm guessing it would work. The only problem with MSMA is that it can be hard on bermudagrass at higher rates, and you shouldn't use it at all on St. Augustine.

I still use MSMA on my zyosia and i use it previously on my bermuda at my previous house. I know it is not for residential use now but it is the only thing I have found that will actually kill dallisgrass. It can still be used on golf courses and public parks so honestly how bad can it be to be used in your lawn twice a year? It is easy to obtain as well.

As far as the OP really no need for a selective herbicide in the flower bed. Round up type Home Depot brands are just not what they used to be. Got to go a higher concentration if you really want it to work.

Likely because there isn't a real set rate on dosage if you read the label, and people end up killing their whole lawn because they put out too much chemical. But yes, it's the best thing there is on Dallisgrass.
BQ_90
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AG
nm
cevans_40
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HTownAg98 said:

docb said:

HTownAg98 said:

mwlkr said:

MSMA.

MSMA is not labeled for residential lawns anymore. Not saying it won't work on it, and if it's not on the label I won't recommend it, but if you just happen to have an old label, I'm guessing it would work. The only problem with MSMA is that it can be hard on bermudagrass at higher rates, and you shouldn't use it at all on St. Augustine.

I still use MSMA on my zyosia and i use it previously on my bermuda at my previous house. I know it is not for residential use now but it is the only thing I have found that will actually kill dallisgrass. It can still be used on golf courses and public parks so honestly how bad can it be to be used in your lawn twice a year? It is easy to obtain as well.

As far as the OP really no need for a selective herbicide in the flower bed. Round up type Home Depot brands are just not what they used to be. Got to go a higher concentration if you really want it to work.

Likely because there isn't a real set rate on dosage if you read the label, and people end up killing their whole lawn because they put out too much chemical. But yes, it's the best thing there is on Dallisgrass.

1-2 oz/1000 square feet
HTownAg98
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MSMA 6 has a rate of 1 to 2 ounces in 1 to 2.5 gallons of water. That's quite the range.
cevans_40
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HTownAg98 said:

MSMA 6 has a rate of 1 to 2 ounces in 1 to 2.5 gallons of water. That's quite the range.

per 1000/square feet. Its pretty clear
HTownAg98
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Most people spraying MSMA in their yard are going to be spot-spraying. A rate per a certain square footage isn't going to help. The per 1,000 square feet is great if you're doing broadcast with a calibrated sprayer.
docb
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AG
HTownAg98 said:

Most people spraying MSMA in their yard are going to be spot-spraying. A rate per a certain square footage isn't going to help. The per 1,000 square feet is great if you're doing broadcast with a calibrated sprayer.

Absolutely. I always just spot spray with MSMA. It will yellow the bermuda but it will bounce back. Usually takes two applications for the dallisgrass. That is some tough nasty grass! Honestly I was hesitant for a long time to use the MSMA but I just got tired of buying stuff at Home Depot that didn't even put a dent in it.
HTownAg98
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You can pull it, and I use that term very loosely, because it's almost impossible to do it. I got some out with a spade and a log as a fulcrum. That crap has an amazing root system (probably why it's so hard to kill).
schmellba99
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AG
HTownAg98 said:

Most people spraying MSMA in their yard are going to be spot-spraying. A rate per a certain square footage isn't going to help. The per 1,000 square feet is great if you're doing broadcast with a calibrated sprayer.

I have a 110gallon sprayer and mix ~4pints (half gallon) per 100 gallons for broadcast spraying in the yard. Probably could go a little heavier because I still have areas of bahia that aren't gone and taken over by either bermuda or St. Augustine yet.
HalifaxAg
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Shoot'em in the nutsedge?
TX AG 88
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It's a unique situation but I had an ~ 8' x 3' raised flower bed with some rose bushes that I wanted gone. Under the roses was completely full of nut grass. After I chopped the roses out, I went after the nut grass manually. I'd dig up the bed down to 6 or 8 inches depth. I'd pull every nut and runner out that I could find. A week later, it was growing back, but thinner. I'd repeat the process. In about a month, the nut grass was all gone and I planted some new shrubs (through slits I cut in the weed cloth I laid down first.)

I had a a clear space and no time crunch, so that worked for me. It was good therapy, I got to take my frustrations out on that damn nut grass!
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