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

Product Features

  • Easy-to-use 13.5g pack treats 1,000 sq ft
  • Controls yellow & purple nutsedge, kyllinga and more
  • Contains a non-ionic surfactant to help aid absorption into waxy nutsedge leaves

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Average Rating

4.5 out of 5 stars Rating: 4.5

814 Reviews | 260 Q&A

Product Overview

SedgeHammer +  Herbicide kills nutsedge without injury to turfgrass, established ornamentals, shrubs, and/or trees. SedgeHammer Plus (+) 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" nutsedge killers and pets and people can return to the treated area once the spray dries. 

The “+” (plus) in SedgeHammer + indicates that it already contains a non-ionic surfactant.  This saves you time and money – no additional product is needed and no extra time spent mixing in additional product.  The surfact helps the Sedgehammer Plus spray spread across and penetrate into the waxy leaves of nutsedge more easily.  The surfactant also helps with water dispersion, ensuring the spray is even across the leaf for absorption into the vascular system of the plant. 

Product Features:

  • Easy-to-use pre-measured packs
  • Contains built-in non-ionic surfactant
  • Can be used on a variety of warm and cool season turf types
  • Knocks down yellow and purple nutsedge, selectively control Kyllinga species, and certain broadleaf weeds
  • Labeled for use on commercial and residential area, established lawns, golf courses, and woody ornamentals in landscaped areas

Each 13.5 gram packet will treat 1,000 sq. ft.

For larger areas, consider using SedgeHammer Herbicide in the 1.33 oz. bottle, which treats up to 40,000 sq. ft.  

Features and Specs

Active Ingredient Halosulfuron-methyl 5%
Target pests Purple Nutsedge, Yellow Nutsedge, Kyllinga
For use in Turfgrass, Landscaped areas, and other non-crop areas
* See label for complete list
Application Mix 1 packet in 1 gallon of water to cover 1000 sq. ft.
Yield 1 packet covers 1000 sq ft.
VT (Restricted To Licensed Applicators Only)
Shipping Weight 0.06 lbs
Manufacturer Gowan
UPC 714654514980
EPA Registration 81880-24-10163


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.

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: 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.

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 gallon of finished solution covers approximately 1,000 square feet. 

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.  For treating larger areas, consider SedgeHammer Herbicide in the 1.33 oz. bottle.  

  • Open and pour entire 13.5g packet into 1 gallon of water in a hand-pump or backpack sprayer
  • Shake to mix well (no additives needed)
  • Spray on affected areas

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
  • 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

Review Search   
Sort Reviews
  • 5 of 5 Stars

    It works!

    By Charles 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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    384 of 393 people found this review helpful

  • 5 of 5 Stars

    Sedgehammer - THE solution for nutsege

    By Len 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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    285 of 290 people found this review helpful

  • 5 of 5 Stars


    By Gary 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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    212 of 219 people found this review helpful

  • 5 of 5 Stars

    SedgeHammer Works!

    By Angela 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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    173 of 180 people found this review helpful

  • 4 of 5 Stars

    The Sedge Gets Hammered

    By Dennis 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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    124 of 133 people found this review helpful

See all 814 customer reviews

Questions & Answers

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Sort Questions
I 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?

You 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

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483 of 503 people found this answer helpful

After 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?

Typically 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.

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344 of 370 people found this answer helpful

When is the best time to apply Sledgehammer, before or after cutting your lawn?
We 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.

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333 of 341 people found this answer helpful

How 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?

We 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.

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324 of 335 people found this answer helpful

What 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

All 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.

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254 of 268 people found this answer helpful

See all 260 customer questions

SedgeHammer Plus Herbicide 4.5 out of 5 stars Rating: 4.5 (814 Reviews / 260 Q&A)

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