Is there anything that permanently kills nutsedge?

gardenfanatic(MO zone5b)May 29, 2011

I've been fighting nutsedge for nearly 10 years now. I started with pulling, and when that didn't work, I started spraying Sedgehammer (formerly Manage). The nutsedge would die from the Sedgehammer, but come back. I've even tried spraying twice - once in June, and again in August. It still comes back the following year, just as strong as ever.

Obviously, Sedgehammer kills the top growth, but not the root, or it wouldn't keep coming back. Is there anything that will actually kill nutsedge permanently, down to the root?


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I havent tried it personally, but Tenacity is labeled for yellow nutsedge. It also seems to be effective against many weeds that it's not even labeled for. It's about $50 at Lesco.

Here is a link that might be useful: Tenacity

    Bookmark   May 29, 2011 at 9:20PM
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In addition to Tenacity, you could also try this product which is available at Home Depot and is a bit cheaper:
There is also a herbicide called Sedgehammer that is supposed to work well, but I think you would have to buy it online or at a place like Lesco:

    Bookmark   May 30, 2011 at 12:13AM
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botanicalbill(9b SWFlorida)

sedgehammer and image both kill nutsedge. It works by binding at growth sites and stop it from growing. This is in the grass part and the root. So it kills the plant, root and all. What is probably happening is you are not using per-emergent and a few of the millions of seeds in your lawn keep sprouting, and growing.
Thats my guess.

    Bookmark   May 30, 2011 at 1:10AM
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garycinchicago(Z5 Chicago IL.)

>"I started spraying Sedgehammer (formerly Manage). The nutsedge would die from the Sedgehammer, but come back. I've even tried spraying twice - once in June, and again in August. It still comes back the following year, just as strong as ever."

Did you read the label? Did you read the instructions carefully?

Let's then assume that you did and used the recommended surfactant and also didn't allow the mixed product to sit more than 12 hours, when you applied again in August. Then it should have worked fine, killing the bulbets and all.

But that is only *IF* you had correctly ID'd the weed as 100% proof positive nutsedge and not just assumed/guessed it was nutsedge.

    Bookmark   May 30, 2011 at 2:01AM
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What is your frequency of watering? How much and how often?

    Bookmark   May 30, 2011 at 7:31AM
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gardenfanatic(MO zone5b)

I never water. In late summer, drought conditions will cause the grass to be brown and dead, but the nutsedge is still happily growing. It's an aggravation. And once again, the nutsedge is now starting to grow.

And yes garyinchicago, it is nutsedge. Yes, I used surfactant and sprayed as soon as I mixed it.


    Bookmark   May 30, 2011 at 10:08AM
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Then Gary is ain't nutsedge, Sedgehammer isn't being applied at the recommended rate or whatever surfactant your using isn't getting the job done.

When used correctly, the success rate for Sedgehammer is high.

    Bookmark   May 30, 2011 at 12:16PM
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Is it possible that the weed you are trying to control is actually Green Kyllinga?

    Bookmark   May 30, 2011 at 1:02PM
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botanicalbill(9b SWFlorida)

I use sedgehammer that is 7 years old. still kills the the stuff with one scoop per gallon of water.
I let the sedge grow high. I mist it with sedgehammer. I make sure I mist it till I see a drop or two roll down the leaf to the crown of the plant. A day later it stops growing. About a week later it starts to yellow. I then mow and wait a few days to see what is growing, incase I missed a few.

    Bookmark   May 30, 2011 at 4:13PM
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Near....You're probably right.

    Bookmark   May 30, 2011 at 10:02PM
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dchall_san_antonio(8 San Antonio)

Green kyllinga is growing against my neighbor's house next to my driveway. It has never been watered, ever, and survives our roughest droughts. Quite an amazing plant. Where nutgrass does not survive, this stuff has a modest foothold. At first glance it looks much like nutgrass on steroids. Then you see the flower and realize it is a different plant.

    Bookmark   May 30, 2011 at 11:02PM
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botanicalbill(9b SWFlorida)

It has the white puffy heads, right? Sedgehammer wipes it out. I had a 5 foot by about 7 foot section of this stuff. One spray with sedgehammer and two weeks, it was gone. Its a type of sedge, one of hundreds of types.

    Bookmark   May 31, 2011 at 3:57PM
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I agree with the above posters. I used Prosedge (about $90 for 1.33 OZ) which is the same thing as Sedgehammer. I was shocked at how well it worked. It killed the Nutsedge within a week. It stopped growing a few days after spraying it. I used 2 gallons to get all the areas of my lawn that had Nutsedge. What I bought can make 40 gallons. So I'm good for a while. As others have noted you might have seeds in your turf or perhaps you missed some of it when spraying? This stuff drove me crazy. I would mow my lawn and 24 hours later the Nutsedge was already a few inches higher than the grass. I expected a bigger fight but this Prosedge knocks it out. It also did not do any harm to my grass and I sprayed when it was in the mid 90s (

    Bookmark   August 17, 2011 at 3:40PM
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I think one thing that isn't clearly stated, at least in its entirety from what I can gather, is that the frequency is what's at the heart of controlling the dreaded sedge. Because the tubers grow underground, and on a fairly mature plant, no longer need energy from that emerged parent you just sprayed, a follow-up treatment is a must, maybe even two or three to thoroughly get rid of the spawn of the garden devil.

Killing the nutsedge that grows above the ground when tubers have already started (from what I read is about, or just before they grow 5 leaves or so) will not stop the tubers that have already started in that single treatment. The nut is now developed and no longer feeds off of that shoot. The tubers will continue to use whatever remaining energy it can muster and find the sun to reap more havoc. And itâÂÂs true, as pointed out before, stopping the water doesn't get rid of it, only slows it. Drying out the ground only makes the nut go dormant! Even a couple years after you have been boasting all last year of your so-called success, a good hearty soaking and those forgotten nuts things will spring forth as they did in my lawn with a big fat middle finger!

I am of the belief that you give the turf a good once-over with a good selective herbicide for the whole lawn, or control area. Then two weeks or so later, start spot treating the new tubers that will spring up. But don't wait to wait too long, if the new ones get too much energy from basking in the sun it just found, it too will create new tubers and you are back at the beginning.

If they have invaded a smaller flowerbed, the time to mix a batch and spray is also the same amount of time it takes to grab that hand shovel you already use weekly, and dig those darn thing up! Dig several inches deep, and a few inches around the sedge shoots to get to the nut, and its tubers. Let the soil sift through your fingers while you search for more tubers and nutlets. You can bag them, or do as I do let them feel the pain of roasting in the Arizona sun on the sidewalk and drying out! Revenge is a dish best served hot & dry! Check the bed again in a few days for a few more weeks, plucking and digging when you see them mockingly return, albeit with about 40% less stored energy. Heck, while you're turning that soil, give it the nutrients and compost it loves and let those lovely wanted plants know you are on their side.

Here is a link that might be useful: UofA Nutsedge Control in Turf

This post was edited by eline65 on Fri, Sep 6, 13 at 11:18

    Bookmark   September 6, 2013 at 10:57AM
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When we lived in Orange County, I had a bucket about a quarter full of nutlets I collected from mine and my sister's yard one day (we lived across the street from each other). My son, who was 7 at the time took the bucket across the street to our neighbor's house and dumped it all over their front yard so he and their son could fill the bucket with water.

My sister still lives across the corner and when I visited her last year (11 years after the incident), the yard where those nuts were dumped is pretty much 100% Nutgrass. Have always wondered if I should tell them... True confession.

    Bookmark   September 17, 2013 at 11:03PM
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shortlid(Derry, NH)

I have been fighting it for five years also. Previous owner was ederly and never maintained the lawn. Ortho Nutsledgekiller works but I can't get enough from my local Home Depot to do my whole lawn. Any sugestions.

    Bookmark   September 19, 2013 at 8:21AM
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I have been dealing with and treating yellow nutsedge for years in various areas and various types of grasses. I have found it likes to grow more often in the Bermuda grass. Aerations can help with nutsedge on a year to year basis to provide more oxygen to the soil, but there will never be a full proof way to rid nutsedge on a year to year basis. We tried a new pre emerge that was supposed to help with nutsedge, but from what I have seen it only did so much. The best product is obviously sedgehammer. Usually the best mixture that I feel works best is to use the scoop that comes with it and use just one scoop per 3 gallons of water.

    Bookmark   July 14, 2014 at 4:05PM
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This thread arose from the dead. :-)

I use Prodiamine as a pre-emergent in the gardens (where I get nutsedge) and that helps. Apply in spring before soil temperatures rise, and you can use any pre-emergent you want and is compatible with the plants you're applying it near.

For post-emergent control, a tiny shot of Tenacity takes nutsedge down in a week. Several rounds are required to control the nutsedge patch as not all the root nutlets are awake when sprayed.

    Bookmark   July 14, 2014 at 4:19PM
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Will Sedgehammer kill wildflowers?

    Bookmark   July 20, 2014 at 12:01PM
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>>Will Sedgehammer kill wildflowers?

Some yes, some no. Check the label for ornamentals and annuals it's safe to use around, if any--sometimes they just blanket ban it under the "better safe than sorry" rule.

I use Tenacity and can spray thistles in the middle of my asters. However, the aster turns white for a month or so, and I have to be careful not to hit too much of the aster plant or it'll die along with the thistle.

There's a case where it's a technical "no" that I turned into a "with care."

    Bookmark   July 21, 2014 at 1:53PM
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