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Sedgehammer Nutsedge Killer

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Sedgehammer Herbicide is a selective herbicide used for post-emergent control of Nutsedge and other weeds in turfgrass and landscaped areas. Sedgehammer can be used in residential, commercial and industrial sites for post-emergent control of select weeds.

Target Pests

Sedgehammer Herbicide is for post-emergent control of sedges such as purple and yellow nutsedge

For Use In

Sedgehammer Herbicide is for use in established lawns ornamental turfgrass and landscape areas. Can also be applied in residential turf other non-crop sites including: airports cemetaries fallow areas golf courses landscaped areas public recreation areas residential property roadsides school grounds sod or turf seed farms sports fields fairgrounds race tracks tennis courts campgrounds and rights-of-way.


For a broadcast application for post-emergent control of sedges use at a rate of 2/3 to 1 1/3 ounce per acre. For spot treatments with Sedgehammer Herbicide use at a rate of 0.9 grams in 1 to 2 gallons of water to treat 1,000 square feet. For more specific application rates refer to label above.

Coverage Area

Each package of Sedgehammer Turf Herbicide will cover approximately 1,000 square feet.

Time to Kill

The active ingredient is absorbed into leaf tissue as quickly as 24 to 48 hours after application, then translocated through the plant’s vascular system. The herbicide quickly inhibits amino acids, halting cell division and plant growth in both roots and shoots, causing eventual death in target plants.

Mix Rate

Each 13.5 g packet makes 1 gallon of finished solution and already contains a surfactant. Each 1.33 oz. bottle makes 40 gallons of finished solution. Each gallon of finished solution covers approximately 1,000 square feet. In high volume broadcast applications, each 1.33 oz. bottle covers 1-2 acres.

Active Ingredient

* 1.33 oz bottle - Halosulfuron-methyl - 75% *

* 13.5 gram package Halosulfuron-methyl - 5% *

Sedgehammer Nutsedge Killer

Control Stubborn Nutsedge with Sedgehammer

SEDGEHAMMER is a selective herbicide concentrate for post-emergence control of stubborn sedges and unwanted weeds such as purple and yellow nutsedge in established lawns, ornamental turfgrass, and landscaped areas. SEDGEHAMMER may be applied to commercial and residential turf and on other non-crop sites. Sedgehammer can also successfully control ragweed, pigweed, sunflowers, velvet leaf and horsetail among others.

Sedgehammer is selective which means that you can apply Sedgehammer on commercial and residential turf anywhere without worrying about harming your desired plant life, ornamentals or shrubs.

How to Apply Sedgehammer

To prepare sedgehammer, simply dilute the powdered concentrate with water into a pump sprayer according to rates indicated on the product label. For best results, apply to well-established turf when weeds are actively growing, spraying target weeds until the leaf surfaces are visibly wet. You should make the application when rainfall isn't on the forecast for at least four hours and outside temperature does not exceed 85 degrees. Do not mow before or after the application for at least two days.


Sedgehammer begins working in as quickly as 24 to 48 hours after application but results may not begin to show until 5 to 7 days later. In some cases a second treatment may need to apply again after 6 to 10 weeks.


The use of a non-ionic surfactant is recommended to be added to the mixture of Sedgehammer for better results of the product sticking on undesired weeds.


More about Non-Ionic Surfactants

A nonionic surfactant is an additive that aids the penetration of Sedgehammer into the plant tissue. Surfactants are not only used in horticulture but are commonly used in many cleaning products. Their properties enable products to “sheet” or spread across a surface. It is always recommended that a surfactant be used to help SedgeHammer penetrate the waxy layer of the nutsedge leaf. The surfactant also aids in dispersing the water droplets evenly across the leaf tissues and facilitates adsorption into the vascular system of the plant.

For best results, add a surfactant that is specifically made for horticultural purposes and labeled for use with an herbicide. If a nonionic surfactant is not available certain dishwashing detergents that contain high amounts of a nonionic surfactant may be helpful. Check the label of a dish soap to see if it contains a nonionic (not anionic) surfactant. The soap may contain both or just the anionic surfactant. If the label says it contains a nonionic surfactant, that is preferred. Dish soaps that are concentrated and are effective in grease dispersion often contain nonionic surfactants. Add the detergent last and mix by gently swirling together. See the”How to Use” page for more information.



Red Spray Pattern Indicator (Brandt Mark-It) - Keep track of your spraying and avoid overspraying with this spray.


As always, stay safe when spraying chemicals with the help of homeowner pesticide safety kit

Product Q & A

Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 16 questions Browse 16 questions and 19 answers
is this product safe for children and dogs?
A shopper on Aug 14, 2017
BEST ANSWER: I think the product is relatively safe if used accord to label instructions, however, i would not allow my children nor pets access to the area for at least 12 to 24 hours. Also I would make sure pets don't eat the treated grasses nor roll in it excessively. Same for children. The product works well, though it took weeks for the sedge to totally die and disappear. I was happy with the results.
Will re-application be required every year? How long to get this stuff to stop coming back???!!
Matt on Jul 24, 2017
BEST ANSWER: Yes, nutsedge usually requires 2 applications, usually better to apply in early spring with it is a young plant.

You would be able to get control in the year.
I have ground cover jasmine. I also
have sedgegrass. I would like to KILL the sedgegrass! Will this product kill my jasmine?
Samira on Feb 13, 2018
BEST ANSWER: The Sedgehammer will only target sedge it would be the perfect product to use in that area.
Will sedgehammer kill asparagus ferns?. Cannot get rid of it.
A shopper on Sep 29, 2017
BEST ANSWER: It will not kill asparagus ferns, best to apply Roundup Quick Pro, it will take some effort to get control of them.

Is it safe to use on st. Augustine grass?
Johnnie G on Jun 29, 2018
BEST ANSWER: Yes, Sedgehammer is safe for St. Augustine and all other types of lawns.
I have used sledgehammer several times and nut grass continues to return. I don’t cut it I just spray?
Raymond H on Jun 26, 2018
BEST ANSWER: Sedgehammer is best when used on young plants, and does require multiple applications.

Has it been properly identified as sedge?
If I have a really bad, almost total invasion of sedge, would the 1.33 oz be enough for the 2 acres the mix rate claims it can cover or should I stick to an acre or acre and a half to get a strong enough concentration rate to be effective?
Alan W on Jun 19, 2018
BEST ANSWER: Start with 1/2 treatment on one acre because you're going to see results in a day or two then proceed accordingly.
I have nutsedge in an area with dwarf mondo grass. Will this product kill the mondo grass?
Calvin C on Feb 24, 2018
BEST ANSWER: It should cause no harm to the Mondo Grass,

SEDGEHAMMER is a selective herbicide for post-emergence control of sedges such as purple and yellow nutsedge in established lawns,
ornamental turfgrass, and landscaped areas. SEDGEHAMMER may be applied to commercial and residential turf and on other non-crop sites
including: airports, cemeteries, fallow areas, golf courses, landscaped areas, public recreation areas, residential property, roadsides, school
grounds, sod or turf seed farms, sports fields, landscaped areas with established woody ornamental, fairgrounds, race tracks, tennis courts,
campgrounds and rights-of-way
just notified that a neighbor used a lot of different pesticides today, are my dogs safe to go outside? not sure which house but think directly behindseperated by fence.
A shopper on Oct 11, 2017
BEST ANSWER: Yes, they will be completely safe.
Mix rate of sedge hammer to 25 gallons of water? Treating one acre.
A shopper on Aug 17, 2017
BEST ANSWER: Each 1.33 oz. bottle makes 40 gallons of finished solution. Each gallon of finished solution covers approximately 1,000 square feet. In high volume broadcast applications, each 1.33 oz. bottle covers 1-2 acres.
Product says is can be used in non-crop landscaped areas. We have a heavy bed of nutsedge in our landscape areas and grass.

Want to confirm that this will not harm my scrubs in the landscaped areas?
RP on Jul 19, 2017
BEST ANSWER: It depends on what type of ornamental, Sedgehammer is very safe when it comes to woody ornamental plants but could cause.
Can sledgehammer be used safely in raised bed vegetable garden
Ed on Jul 7, 2017
BEST ANSWER: Do not apply as an over-the-top spray to desirable flowers, ornamentals, vegetables, shrubs or trees. You can apply it directly to the sedge, but not spray the entire garden.
Can this product be used in pet areas - around dogs that eat the grass?
Vick on May 21, 2017
BEST ANSWER: Yes, keep the pets off the area until it fully dries. Once it has dried the pets will be able to come out this can sometimes take 2-3 hours depending on how much you sprayed.
Is this product effective in star flowers?
jimbo on Apr 22, 2017
BEST ANSWER: Yes, Sedgehammer is safe to apply to lawns and ornamentals, and will only control sedges.
Can this product be used in flower gardens such as daylilies (Hemerocallis), Roses
Dera on Mar 11, 2017
BEST ANSWER: No, it is labeled for use on turf lawns.
Can this product be used on Florida lawns in the heat if summer when most days are 88 degrees and higher?
North Florida on Jun 17, 2016

Customer Reviews

4.7 / 5.0
22 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Works Better Than a Hammer
Outperformed expectations. Follow directions and give it time to work and it will alleviate your problems with nutsedge. I didn't cover as much square footage per gallon, but it killed the weeds and that's what is important to me. Highly recommend Sedgehammer.
September 14, 2017
11 months ago
Excellent Product
Excellent price on an excellent product, able to mix it as heavy or light as needed for the application.
September 24, 2015
Best stuff for weeds
If you have weeds this is what you should use. Kills any weed incl. poison ivy in a couple of days with one application. Have been using QuickPro for two years with great results.
September 15, 2015
I Hate Nutgrass!
Best product I've ever found to kick Nutgrass in the nuts. Apply on a cool day. I spot spray, sometimes also finding it helpful to mouth "die MF die" while applying.
July 4, 2015
only thing that works
This is the only thing that I have found that works on nutgrass. Wish it weren't so expensive because I have an ongoing battle with this.
May 8, 2015
Works great in controlling nutgrass in my lawn and flowerbeds.
August 13, 2014
Excellent Service!!!
I will recommend this store in a heart beat!
July 1, 2014
Great product and service!
Kills nuts edge without harming Bermuda grass! I would buy again!
June 20, 2014
Sedgehammer works!
We own a number of properties and almost all had nut sedge problems this year. Sedgehammer was very effective and I am 100% pleased with the results. We sprayed selectively where the nut sedge was present. It took about 10 days before the nut sedge died. The rest of the lawns were unharmed. The label says that a sticking agent is not required, but I added 2 tsp. per gallon just to be sure.
August 22, 2013
Works Great
I used it about 2 weeks ago and all of it is dying. Love this! Will use it every year. And it's easier now--all you do is add water, mix and spray!
August 16, 2013

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