SedgeHammer Herbicide - 1.33 oz. bottle

4.5 out of 5 stars 56 Reviews | 30 Q&A

SedgeHammer Herbicide - 1.33 oz. bottle

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Average Rating

4.5 out of 5 stars Rating: 4.6

56 Reviews | 30 Q&A

Product Overview

SedgeHammer Herbicide knocks out nutsedge without injury to turfgrass, established ornamentals, shrubs, and/or trees. SedgeHammer provides post-emergence control of both purple 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.  Mix 0.9 grams in 1 gallon of water. 1 mixed gallon of solution will cover 1000 sq. ft. One full bottle (1.33 oz.) makes approx. 40 gallons of finished solution.  Measuring scoop included.  

SedgeHammer is very similar to SedgeHammer +, except that it does not contain a surfactant.  We highly recommend using a non-ionic surfactant with SedgeHammer to increase its effectiveness on nutsedge.  

Features and Specs

Active Ingredient Halosulfuron-methyl 75%
Target pests Purple Nutsedge, Yellow Nutsedge, Kyllinga
For use in Turfgrass, Landscaped areas, and other non-crop areas
* See label for complete list
Yield Mix 0.9 grams in 1 gallon of water. 1 mixed gallon of solution will cover 1000 sq. ft. One full bottle (1.33 oz.) makes approx. 40 gallons of finished solution.
VT (Restricted To Licensed Applicators Only)
Shipping Weight 0.20 lbs
Manufacturer Gowan
UPC 714654357204
EPA Registration 81880-1-10163


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.

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

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%

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.

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:
*1.33 oz. bottle – Use 0.9 g (one spoonful) in 1-2 gallons of water with 2 teaspoons of a nonionic surfactant

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.

SedgeHammer Features

  • May be tank mixed with Glyphosate herbicides in areas such as rights-of-way or fallow land.
  • Scoop included with 1.33 oz. bottle.
  • Superior control of yellow and purple nutsedge.
  • 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

    Awesome product

    By Gustavo on 05/29/2020

    I tried so many different weed killers with no success to kill nutsedge weeds in my flowerbeds. I was even thinking in removing all my flowerbeds because of these weeds. I used this product and killed them! Very effective and highly recommended!! The flowers did not suffer when I applied the weed killer.

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    53 of 53 people found this review helpful

  • 5 of 5 Stars

    Effing Finally!

    By Sora on 04/09/2020

    I bought this last year to kill sedge that kept popping up from when I used Bonide's Sedge Ender (which is a good product but if a tuft survives it just re-spreads). This stuff actually killed the sedge 100%, none has come up this year at all and I'm now finally able to put down grass seed to grow in the dead spots.

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    39 of 39 people found this review helpful

  • 5 of 5 Stars

    Great Product - Highly Effective and a value

    By David on 05/31/2020

    I have been struggling to control nutsedge. Like most people, I was relying on products off the shelf with marginal results. Fortunately, I listened to a local radio garden show, and learned about Sedgehammer. What a result!! And what a value in this package. The spoon included, measured level, goes into a gallon of water. This creates the value as I calculated 80 gallons of product from this bottle. I have applied twice. Both applications were spot treatments, but since some weeds germinated after the initial treatment, I waited 30 days to treat those. The product begins to work in a matter of days, and two weeks later there is substantial die-back. Just like I anticipated. Remember to use a surfactant.

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    31 of 32 people found this review helpful

  • 5 of 5 Stars

    Great nutsedge control

    By Teri on 05/15/2020

    I used this during my working years. Now I have an impressive population of nutsedge at my house. I've tried the OTC product from the box stores and had marginal success. I had to treat my entire back yard to treat it all. Two weeks later and the plants are yellow.

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    30 of 30 people found this review helpful

  • 5 of 5 Stars


    By Justin on 11/02/2015

    This is the only thing I use on nutsedge. Don't be afraid of the price because it works!

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    27 of 28 people found this review helpful

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Questions & Answers

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Sort Questions
Using the scooper provided with the SedgeHammer Herbicide 1.33 ounce bottle, how many scoops per 2 gallon sprayer?

You will need 1 scoop of SedgeHammer Herbicide per gallon of water.  Please refer to the product label for complete application instructions.  

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71 of 76 people found this answer helpful

What is the capacity of the spoon that comes with Sedgehammer Herbicide?

Sedgehammer (1.33 oz bottle) comes with a measuring spoon. Each level spoon (0.9 g) of product is mixed to one gallon of water and 2 tsp of Non-Ionic Surfactant per gallon of water. Please refer to the product label for complete application instructions.

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35 of 46 people found this answer helpful

What product do I use for nutsedge control in my bahia grass pastures?

I have 15 acres and need an herbicide to kill off the nutsedge in FL?


You could apply Sedgehammer as long as the pasture is not used for grazing. Each 1.33 fl oz bottle will treat an acre.

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21 of 25 people found this answer helpful

I have SedgeHammer with the little spoon. Do I add 1 or 2 gallons of water?

You will use 1 scoop/spoon of SedgeHammer in up to 2 gallons of water per 1000 sq. ft.  Water is only the carrier, so you will use whatever amount necessary to adequately disperse the product over that 1000 sq. ft. area.  

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17 of 19 people found this answer helpful

How many gallons will one bottle of sedge hammer 1.33 oz make?

Sedge Hammer in the 1.33 oz. bottle will make about 40 gallons worth of concentrate. 

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11 of 12 people found this answer helpful

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SedgeHammer Herbicide - 1.33 oz. bottle 4.5 out of 5 stars Rating: 4.6 (56 Reviews / 30 Q&A)

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