Sedgehammer Herbicide

Sedgehammer Herbicide, manufactured by Gowan, is a specially designed post-emergent herbicide that controls numerous nutsedge and broadleaf weeds in residential and commercial turf, non-crop sites, and other landscaped areas. 

This herbicide contains Halosulfuron-methyl 75.0%, an active ingredient that inhibits weed growth and kills them down to the root system. Due to its selective formulation, Sedgehammer controls tough weeds like sedges, kochia, and common groundsel without injury to turf and woody ornamentals. 

Sedgehammer Herbicide is a long-lasting systemic herbicide that offers a reliable yet economic solution against weeds, especially sedges in lawns, ornamental turfgrass, and landscaped areas. This product ensures a safe solution for homeowners, landscapers, and groundskeepers suffering from persistent sedge and weed issues. Not to be confused with Sedgehammer Plus Nutsedge Killer, which comes as a single-use packet and contains a surfactant.

Tools Needed

It may be applied with a handheld pump sprayer, backpack sprayer, or spray rig. A nonionic surfactant must also be used with this product. This will need to be purchased separately. 

A measuring scoop is provided. 

How to Use

• Step 1: For best results, do not mow turf for 2 days before or 2 days after application. Determine how much Sedgehammer to use by measuring the square footage of the treatment area. Find the square footage by measuring the treatment area length and width in feet, then multiply them together (length X width = square footage). For acreage, take the square footage and divide it by one acre (square footage / 43,560 sq. ft. = acres). A general spot treatment will use 0.9 grams in 1 to 2 gallons of water per 1,000 sq. ft. Add 2 teaspoons (0.3 fl. oz.) of nonionic surfactant per gallon of water. Refer to the product label for specific application instructions. No more than 4 applications can be made per year.
• Step 2: To mix, fill your selected sprayer with half the amount of water and pour in the measured amount of product. At this point, add your nonionic surfactant into the tank as well. Pour in the remaining half of water into the tank. Mix or shake thoroughly for at least two minutes to ensure that the water-soluble bag and ingredients are completely dispersed.
• Step 3: Spray the target weeds thoroughly and wet the entire leaf surface of the undesirable plants. Avoid excessive overlap of the spray. A second treatment can be applied 6-10 weeks after the initial treatment.

Where to Use

Sedgehammer Herbicide can be used on weeds in established lawns, ornamental turfgrass, and landscaped areas. It may also be applied to commercial and residential turf and on other non-crop sites including airports, campgrounds, cemeteries, fairgrounds, fence rows, fallow areas, fuel storage areas, golf courses, landscaped areas, established woody ornamentals in landscape areas, lumberyards, public recreation areas, race tracks, residential property, rights-of-way, roadsides, school grounds, sod or turf seed farms, sports fields, tank farms, and tennis courts.

When to Use

Apply when weeds are present in established turf and other listed foliage. Avoid applications when rainfall is forecasted to occur within 4 hours after application.

This product can be used on seeded, sodded, or sprigged well-established turfgrass. Before application, allow the turf to develop a good root system and uniform stand.

Avoid applying Sedgehammer when turfgrass or nutsedge is under stress, as this may result in turf injury and poor nutsedge control.

Safety Information

Sedgehammer Herbicide is safe to use around children and pets when applied according to the product label instructions. Always wear the proper personal protective equipment (PPE) when mixing and applying this product. 

Keep people and pets away from treated areas until the spray solution has dried. 

Special Information

Do not apply as an over-the-top spray to desirable flowers, ornamentals, vegetables, shrubs, or trees.