SedgeHammer Herbicide

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4.5 out of 5 stars Rating: 4.5

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SedgeHammer Herbicide pack (13.5 grams)

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SedgeHammer Herbicide - 1.33 oz. bottle bottle (1.33 oz)

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SedgeHammer Herbicide - CASE (12 x 13.5 gram packs)SedgeHammer Herbicide - CASE (12 x 13.5 gram packs) case (12 x 13.5 gram packs)

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SedgeHammer Herbicide

We highly recommend using a surfactant with Sedgehammer 1.33 ounce bottle.

Sedgehammer in the 13.5 gram box already contains surfactant.

SedgeHammer herbicide kills nutsedge without injury to turfgrass, established ornamentals, shrubs, and/or trees. SedgeHammer provides post-emergence control of both purple nutsedge and yellow nutsedge. SedgeHammer also controls many broadleaf weeds and suppresses kyllinga. Nutsedge is controlled after emergence in cool and warm season turf grasses such as St. Augustinegrass, Bermudagrass, Kentucky Bluegrass, tall and fine fescue, and perennial ryegrass. Sedgehammer is considered one of the more "gentle to turfgrass" products and pets and people can return to the treated area once the spray dries.

Sedgehammer is the exact same product as Manage Herbicide. The Gowan Company purchased the Manage product and its rights to use from Monsanto in early 2005 and now sells the very same product as Sedgehammer.

How SedgeHammer Herbicide Works

SedgeHammer is a water-soluble granule formulation that is mixed with water and applied to target plants with a sprayer. SedgeHammer is a member of the sulfonylurea family, an ALS (acetolactate) enzyme inhibiting herbicide. 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.

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 the herbicide to “sheet” or spread across the surface of a plant or weed. 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.

SedgeHammer Target Weeds

Purple Nutsedge, Yellow Nutsedge, Kyllinga

WEEDS CONTROLLED WITH SEDGEHAMMER: Purple Nutsedge, Yellow Nutsedge, Green Kyllinga, Annual Kyllinga, Cocklebur, common Sunflower, common Ragweed, giant Ragweed, Pigweed, Velvetleaf, Horsetail

Additional weeds controlled with SEDGEHAMMER+ (small packets) only: Burcucumber (suppression), Corn Spurry, Rice Flatsedge, Philadelphia fleabane, Galinsoga, common groundsel (preemergent only), Jimsonweed (preemergent only), Kochia (suppression), Ladysthumb, common Lambsquarter (preemergent only), Venice Mallow (suppression), common Milkweed (suppression), honeyvine Millkweed (suppression), Morningglory (suppression), wild Mustard, redroot Pigweed, smooth Pigweed, common Poweweed, Purslane (preemergent suppression), wild Radish, Shepherds purse (suppression), Pennsylvania Smartweed

Target Uses of SedgeHammer

SedgeHammer Herbicide is a selective, post-emergent herbicide concentrate designed specifically to kill nutsedge and other broadleaf weeds without injury to turfgrasses, established ornamentals, shrubs, or trees. SedgeHammer can be used in both warm-season and cool-season turfgrasses, landscaped areas, and other non-crop areas.

SedgeHammer will not prevent germination of most labeled target weeds. Rather, it should be applied to actively growing weeds. If turfgrass or nutsedge is under stress, poor control may result. Also, desirable turfgrass, ornamentals, and trees should be well established before application. Do not apply to edible plants or gardens.

*Note that weeds can develop resistance to herbicides. To minimize the potential for resistance development and/or to control resistant weed biotypes, use a variety of cultural, mechanical, and chemical weed control tactics. Rotate with herbicides having other modes of action.

ACTIVE INGREDIENT: 1.33 oz. bottle - Halosulfuron-methyl 75%; 13.5 g package – Halosulfuron-methyl 5%

SedgeHammer Application Instructions

SedgeHammer is a powder concentrate to be diluted with water and applied with a pump sprayer. SedgeHammer should not be applied with hose-end sprayers since they are far less accurate than hand pump sprayers. When applying, spray the weeds thoroughly and wet the entire leaf surface of the undesirable plants. For best results, spray nutsedge after it has reached the 3 to 8 leaf stage of growth.

SedgeHammer often works with one application, but depending on the size and age of the nutsedge a second treatment may be required 6 to 10 weeks after the initial treatment. See “Other Tips” below for more information.

Mixing Instructions, 1.33 oz container:

Using included spoon, measure .9 grams (one spoonful) and pour into 1 gallon of water. Measure level scoops only (not rounded).

*Swirl or mix the solution thoroughly.  The 0.9 grams will cover 1000 sq. ft. One full bottle (1.33 oz.) makes approx. 40 gallons of finished solution.
*Add 2 teaspoons of a nonionic surfactant (spreader sticker) and swirl gently until mixed.

For best results, add a surfactant that is specifically made for horticultural purposes and labeled for use with an herbicide. Use only surfactants that contain at least 80 percent active material. Do not exceed the recommended amount of surfactant due to potential turf injury at higher rates.

*While spraying, periodically swirl or shake the mixture to keep the product evenly distributed in the water.
*Do not store the mixed solution as it will degrade and become ineffective.

The 13.5 gram packets already contain a surfactant, so you only need to mix the contents of the packet itself with a gallon of water. See below for further details. Always read the product label completely before use.

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.

Standard Application Dilution rates / Mixing Ratios for SedgeHammer:

*13.5 g packet – Entire contents of 1 packet (0.5 oz.) per gallon of water – Ideal for spot treatments
*1.33 oz. bottle – Use 0.9 g (one spoonful) in 1-2 gallons of water with 2 teaspoons of a nonionic surfactant – More economical for broadcast applications

Broadcast applications (1.33 oz. bottle only):

*2/3 oz. in sufficient water for uniform application per acre – light infestations
*1 1/3 oz. in sufficient water for uniform application per acre – heavy infestations
*Do not exceed 4 applications per acre per season. Do not exceed 1 quart of surfactant per acre. Mix only what is needed at the time of application. Do not store unused solution.

SedgeHammer is for use in the following areas:

Commercial and residential turf and other non-crop sites including: airports, cemeteries, fallow areas, golf courses, landscaped areas, public recreation areas, residential property, roadsides, school grounds, sports fields, landscaped areas with established woody ornamentals, fairgrounds, race tracks, tennis courts, campgrounds, and rights-of-way

Tolerant Turfgrasses – Cool-Season: creeping Bentgrass, Kentucky Bluegrass, fine Fescue, tall Fescue, perennial Ryegrass; Warm-Season: Bahiagrass, Bermudagrass, Buffalograss (Sedgehammer+ only), Centipedegrass, Seashore pasapalum, St. Augustinegrass, Kikuyugrass, Zoysiagrass


SedgeHammer is not labeled for indoor use of any kind.


See general mixing instructions, mixing rates, and application details above.

Established woody ornamentals in landscaped areas – Apply as a post-directed spray. Avoid contact of this product to leaves of desirable plants since foliar injury, discoloration or death may result.

Horsetail Control – SedgeHammer + (small packets): Apply 1 oz. (27 g or 2 pouches) per 1,000 square feet after horsetail has leafed out. SedgeHammer (bottle): Apply 2 2/3 oz. per acre, or 1.8 g per 1,000 square feet.

This rate of product will control horsetail that is less than 6 inches tall and suppress horsetail that is greater than 6 inches tall. Herbicide symptoms are likely to show within 2 weeks as a necrotic ring at the base of the plant, even though the leaves and stems remain green and a deep leathery green in color.

SedgeHammer Features

  • May be tank mixed with Glyphosate herbicides in areas such as rights-of-way or fallow land.
  • Convenient pre-measured packets or scoop included with 1.33 oz. bottle.
  • Small (13.5 g) packets already contain surfactant.
  • Superior control of yellow and purples nutsedges.
  • People and pets may return to treatment area once spray is dry.
  • Labeled for use in a variety of warm and cool weather turfgrasses.

Extra Tips for Using SedgeHammer

  • For best results, do not mow turf for 2 days before or 2 days after application.
  • SedgeHammer is effective if no rainfall occurs within 3 hours, but best results are obtained with no rainfall or irrigation for at least 4 hours.
  • Use only in established turfgrass: allow turf to develop a good root system and uniform stand before application.
  • Results may take 5-7 days to begin to appear.
  • Do not apply when turfgrass or nutsedge is under stress.
  • Do not apply when temperatures exceed 85 degrees F.
  • Do not apply to golf course putting greens.
  • For transplanted woody ornamentals, allow 3 months after transplanting before applying this product.
  • When using in fallow areas, allow 4 weeks between application and transplanting of woody ornamentals or seeding or sodding of turfgrass.
  • SedgeHammer may remain active in the soil up to 3 years after application.
  • Store concentrate under cool, dry conditions.

Compare to: ProSedge Herbicide

Rating Snapshot

5 stars   276
4 stars   47
3 stars   13
2 stars   5
1 star   25

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Average Customer Rating
4.5 out of 5 stars (366)

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Most Helpful Customer Reviews
  • 169 of 175 people found this review helpful:

    5 of 5 stars  It works!
    By Charles in Bowling Green, Ohio on 06/20/2010

    I've been fighting nutsedge for several years using nutsedge and crabgrass control products. They were disgustingly ineffective. I read of other people's experience with SedgeHammer on a daylily web page and decided to try it. Two days after spraying, the nutsedge started turning brown. Of equal importance, the daylilies surrounding it did not. They show no evidence of ever being near an herbicide. Am I satisfied? You bet!

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  • 105 of 107 people found this review helpful:

    5 of 5 stars  Sedgehammer
    By Gary in Ozark, MO on 07/16/2010

    I hate nut grass. It has been a problem for me from my first yard. I have used Roundup with an eye dropper and even a hypodermic syringe to kill the stuff. Then a man recommended SedgeHammer. The price was a little frightening but my resolve was firm. I bought it from, received it promptly and used it with great success. The yellow nut grass began dying in 3 days and now is gone. I don't know if it will remain "gone", but I have enough of the stuff to "kill" it repeatedly.

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  • 99 of 101 people found this review helpful:

    5 of 5 stars  Sedgehammer - THE solution for nutsege
    By Len in Carrollton, VA on 09/02/2010

    This hot, dry summer we've been having here in Tidewater, Virginia has been awful for the fescue we grow here but perfect for nutsedge. My infestation was extensive. A few tips: Follow all the advice given in the instructions. Make sure the nutsedge has almost a week of growth on it; this is important. If the sedge is too small or you try to use it on a freshly cut lawn, the sedge won't have enough surface area to absorb sufficient herbicide to be effective. Also, make sure you sure use surfactent with the hebicide, it will help this very expensive chemical be absorbed more effectively by the sedge. Give the chemical time to work; the longer you can wait before mowing after application (I waited almost a week before mowing) the better the killoff. By that time (a week after application) I had an almost 95% killoff, the few live sedges were those few I had missed on the first application. One more application on the stragglers will finish the job.

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  • 74 of 77 people found this review helpful:

    5 of 5 stars  SedgeHammer Works!
    By Angela in Philadelphia, PA on 09/06/2010

    Despite the fact that SedgeHammer is very expensive, I do not regret purchasing it because it WORKS! I bought the largest bottle which I think makes up to 40 gallons. So, I'll have enough to last me a few years. I recommend using an herbicide pump sprayer. I bought a Round-Up brand 2-gallon sprayer for $20 and it allows me to not waste as much SedgeHammer as I would if I used a watering can. I had A LOT of well-established sedge. About 7-10 days after the first application the sedge turned yellow and stopped growing and the grass was NOT harmed. I just did a second application because I had missed a lot sedge plants during the first application. This product is worth the $$.

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  • 64 of 69 people found this review helpful:

    4 of 5 stars  The Sedge Gets Hammered
    By Dennis in Yorktown, VA on 07/07/2010

    I have been using this product for several years, and have found it to be the most effective for control of sedge, particularly in beds and around ornamentals in combination with Roundup. Because I am blessed with rich soil, everything grows well - sedge too; so control of sedge is an ongoing battle. The granular form of the product is convenient and easy to measure with the included measuring spoon.

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Most Recent Customer Reviews
  • 1 of 5 stars  not strong, weed come back
    By Frank in North Port,FL.34287 on 12/08/2017

    Sorry but this Powder is not strong enough to kill Sedge weeds.

    Expert Response   Expert response:
    Thank you for your review. We apologize you did not receive the expected results. We would like to take some time out to help troubleshoot with you but will need a little more information. Could you please tell us the rate at which you used the SedgeHammer? Also depending on the size of the nutsedge a second application may be needed 6-10 weeks after the first application.

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  • 5 of 5 stars  Do I like it?
    By Frank in Durant on 11/24/2017

    Sledgehammer is by far the only herbicide for Nutsedge on the market today. Nutsedge goes all the way to the root where others Don't. Used in conjunction with a Surfactant, it market the Sedgehammer stick to the actual weed until it die. This price is about 40% cheaper that over the counter at garden centers or feed and seed stores.

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  • 5 of 5 stars  PURPLE AND YELLOW SEDGE O MY
    By R in JAX FL on 11/15/2017

    1st identify the weeds. 2nd research the weeds (as in how to kill them). Don't ask the helpful guy at the hardware and garden store. He might know less than you.They will sell you a product that claims to kill sedge and/or control it. Three weeks later the weeds and your yard are yellowing! Three more weeks and the grass is dying and the weeds are making a comeback. Sedgehammer works and my grass is still green. Buy the bottle and spray the neighbors yard also. If you don't, the seeds from his weeds will blow into your yard and you will be spraying the weeds again on a Saturday instead of golfing.

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  • 5 of 5 stars  Sedgehammer
    By Ralph in Greer SC on 10/13/2017

    Sledgehammer works very well and does not affect my Bermuda grass. "Big Box" products for Nutsedge are not effective. Price of Sedgehammer at DoMyOwn is less expensive than at local places.

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  • 5 of 5 stars  Killing Killinga
    By Frank in Southampton, NJ on 10/13/2017

    Product works Great

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  • 5 of 5 stars  Happy do it yourselfer...
    By Ken in Orange on 10/06/2017

    Completely satisfied with this product. It did exactly what it claimed to do with easy instructions for a guy like me.

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  • 5 of 5 stars  SedgeHammer worked for me
    By Marion in Cawker City KS on 10/06/2017

    I have had nutsedge in several place in my yard and garden areas---I treated it twice and it did a great job for me.

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  Good product
    By Dennis in St. Louis, MO on 09/29/2017

    Worked as advertised, I'm ordering more! Reasonably priced.

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  Worked really well
    By Ann in Long Island NY on 09/29/2017

    Worked incredibly well. I was shocked how well it worked! Highly recommend to rid your lawn of nutsedge.

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  Impressive product
    By Wayne in Visalia, CA on 09/22/2017

    After trying Nutgrass Killer II at a much more expensive price with no indication of improvement after precisely following the manufacturers instructions, I was not expecting much from SedgeHammer. In fact I purchased enough product for 3 applications fully expecting that one would not completely get rid of the Nut Sedge in our Tall Grass Fescue lawn. To my delight it appears that we have NO surviving plants. Surely I am wrong, but a few weeks have passed and I see nary a plant lift its head with absolutely no indication of stress to our Fescue. I am a believer.

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Most Helpful Q&A's

04/16/2011 Ken

QAfter I mix 2 gallons of Sedgehammer, how long will it remain effective?
I have my nutsedge down to a small area with only a dozen colonies so I mix 2 gallons and fill a one quart spray bottle for convenience. How long will the remaining liquid product remain effective?

ATypically it is not recommended to leave any pesticide solution in a sprayer for more than two weeks at a time.  You should only mix what you plan on using.  If you want to leave the product in the sprayer for longer you should at least shake and agitate the sprayer every few days to keep the solution from separating.

80 of 81 people found this answer helpful.
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08/12/2013 C from Baton Rouge, La

QI notice that you recommend that Sedgehammer not be applied when temps are over 85F.
Can it be safely applied in the early morning prior to the high afternoon temps to avoid damaging other plants?

AYou can safely apply Sedgehammer in the early morning to avoid damaging other plants, it is only during application do you want to avoid spraying when temps are above 85F

55 of 56 people found this answer helpful.
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02/10/2013 Fred

QHow long does Sedgehammer take to break down?
I had a bad infestation of nut grass in a garden bed which I have since sprayed. How long before I can safely use it as a vegetable garden?

AWe checked with the manufacturer on this one and they told us that the product can stay active in the soil for up to 3 years and a veggie garden should not be planted in this area for at least 3 years.

52 of 54 people found this answer helpful.
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07/11/2011 Laurence

QWhat surfactant should I use with the Sedgehammer Herbicide?
Is there a preference as to which type? I noticed there are varying types, Non-Ionic, DyneAmic. Please advise as I plan to purchase ASAP. Thanks

AAll the surfactants on our website are non-ionic which is the type of surfactant the manufacturer of SedgeHammer herbicide recommends for use with their product in the bottle size (1.33 oz). The 13.5 gram pack of SedgeHammer already includes a built-in surfactant.

50 of 55 people found this answer helpful.
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08/02/2013 George from Warminster Pa.

QWhen is the best time to apply Sledgehammer, before or after cutting your lawn?

AWe recommend to apply Sedgehammer two days after mowing your lawn. This will allow the weeds to be more open to absorbing the Sedghammer. You also want to wait at least 2 days before mowing your lawn after application.

48 of 48 people found this answer helpful.
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Most Recent Customer Questions

12/26/2017 Wendy from Claremont, Ca

QWhat night/daytime temperatures are too cold to effectively use SedgeHammer Herbicide?


SedgeHammer Herbicide is a post emergent herbicide which should only be used to control listed weeds during a time when they are actively growing. Most weeds are in an actively growing state when soil temperatures (not air) are a minimum of 65 degrees or higher consistently for a week or more. 

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11/21/2017 Gerald from St Michael, Barbados

Q How and when can I plant Bermuda grass after I have applied SedgeHammer Herbicide and the nutsedge has turned yellow-brown?
Apart from the nutsedge, there are other weeds that I can dig out. Should I attempt to dig out the nutsedge nuts as well?


Areas treated with SedgeHammer Herbicide may be overseeded with annual or perennial ryegrass or bermudagrass 2 weeks after application.  Seed should be applied as directed on the seed packaging.  Sedgehammer often works with one application, but depending on the size and age of the nutsedge a second treatment may be required 6 to 10 weeks after the initial treatment.  You do not want to dig up the treated sedge as it will take time to completely kill and you may need to do another application.

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10/22/2017 Roosevelt from Miami, Fl

QCan another product be added to SedgeHammer Herbicide to help it work faster?


The SedgeHammer Herbicide packs contain a surfactant to increase the effectiveness of the product. It is not necessary to apply it with another product for faster results. Please refer to the product label for complete mixing and application instructions.

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09/17/2017 Jose from Cathedral City, Ca

QAfter applying SedgeHammer Herbicide to Bermuda grass, how long should I wait to overseed with Ryegrass?


According to the manufacturer, after applying Sedgehammer Herbcide it is recommended to wait 2 weeks to overseed on existing lawns and 4 weeks on bare ground lawns (dirt).

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09/17/2017 Josh from Woodbury, Mn

QHow late in the season can Sedgehammer be applied?
I have a nutsedge problem in my yard in Minnesota and just overseeded at the beginning of September. Is October too late to apply Sedgehammer to a yard?


Sedgehammer will only control weeds that are actively growing, so it likely will not kill anyting in the winter once the plants are dormant, and it may only give partial control in the fall. It is best used in the warmer spring and summer months and early fall. 


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09/13/2017 Jr from Midlothian, Va

QCan Sedgehammer damage nearby trees?
I have a three year old Chinese Pistache tree whose leaves have begun to brown after I applied Sedgehammer as per directions to nutsedge in the yard about 25' away. Is this a result of the Sedgehammer?


Per the label of Sedgehammer Herbicide, this product should not be applied over the top of desirable vegetation. We would not recommend using this product within the drip zone of a tree. 

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09/08/2017 Kris from St. Albans, Vermont

QWhat's the minimum temperature for an effective kill with SedgeHammer Herbicide?
I live in the north and its early fall, so getting a day above 60 is not a guaranty.


SedgeHammer Herbicide works best applied when temps are between 60-70 degrees.

1 of 2 people found this answer helpful.
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09/05/2017 Al from Jackson, Ms

QDoes SedgeHammer Herbicide have post-emergent activity on poa annua?
Also would a methylated seed oil improve uptake vs a non ionic spreader/sticker?


The SedgeHammer Herbicide packet contains a surfactant already( the 1.33 oz bottle size should be used with a Non-Ionic Surfactant) so just adding water would be approved. It is not labeled for treating poa annua, only Purple Nutsedge, Yellow Nutsedge and Kyllinga, plus some other listed broadleaf weeds. Please let us know the desired turfgrass species and size area for a recommendation on treating poa annua.

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08/21/2017 Jake from Pittsburg, Tx

QWill SedgeHammer Herbicide kill my Asian jasmine?


SedgeHammer Herbicide can only be applied to established turf.  It should not be applied to ornamental or landscaped areas or edible vegetation.

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08/19/2017 Debra from Los Angeles, Ca

QHow long after Sedgehammer application can I cut the grass?


For optimum results, do not mow turf for 2 days before or 2 days after application of SedgeHammer Herbicide.

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