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20 Best Herbicide For Japanese Knotweed (2023 Updated)

Herbicide for Japanese knotweed is typically used to control the growth of this invasive plant species. Glyphosate is the most common active ingredient in these products, and it works by killing the plants that it comes into contact with.

This can be an effective way to control the spread of Japanese knotweed, but it is important to use the herbicide according to the manufacturer’s instructions to avoid damaging other plants or harming the environment.

20 Best Herbicide For Japanese Knotweed

Product Image Product Name Features Price

Ortho 0204710 Killer WeedClear Weed Concentrate 32 oz

  • 32 oz

Tenacity Herbicide – 8 Ounces

  • Eliminates weeds at seedlings so new grass can flourish.
  • Brand name: Syngenta.
  • Made in United States.

Pramitol 25E Herbicide

  • 1 Gal

Roundup 1.33 gal. Ready-to-Use Extended Control Weed and Grass Killer Plus Weed Preventer Comfort Wand

  • 1.33 Gal

Monterey P – Turflon Ester Concentrate – 8 oz

  • 8 oz

Atrazine St.Augustine Weed Killer – 1 gal.

  • 2.5 Gallons

Pbi Gordon Trimec Lawn Weed Killer – 1 gallon jar

  • 1 Gal

Hi-Yield Atrazine Weed Killer (32 oz)

  • This selective weed killer controls Henbit, Clover, Chickweed and more. See label for full list.
  • Intended for use on St.
  • This 32 oz bottle of liquid concentrate weed killer can treat up to 3,720 sq. feet of lawn.

Pulverize 1 gal. Ready-to-Use Weed Brush and Vine Killer with Nested Trigger

  • Kills the toughtest weeds.
  • Roots and all!
  • Non staining.

Natria 706500A Control Grass & Weed Concentrate 32 oz

  • Non-selective control of listed grasses, weeds and Moss
  • Works fast See visible results in minutes
  • For use on patios, driveways, sidewalks and flower beds

Bonide 310 1qt Weed Beater Ultra Concentrate

  • 32 oz

Voluntary Purchasing Hi-Yield Killzall Weed & Grass Killer – 1 gal jug

  • 1 Gal

RM43 Total Vegetation Control – 2.5 Gallon

  • 2.5 Gal

1.33gal Roundup RTU Weed Killer

  • Kills weeds, won’t harm lawns
  • Kills crabgrass, dandelion, clover & yellow nut
  • Kills 253 types of weeds

Alligare 2,4 D Amine Herbicide 2.5 Gallon- Broadleaf Weed Killer

  • 2.5 Gallon

Gordon's Amine 400 2,4-D Weed Killer, 1 Gallon

  • 1 Gal

Roundup, 4375010 Killer Weed 1.25gal

  • Convenient, ready-to-use refill is easy to pour right into your Roundup for Lawns Extended Wand bottle-no mixing required

Southern Ag Lawn Weed Killer with Trimec – 0.474 L jug

  • For use on 9 turf types.
  • Controls a wide range of lawn weeds.
  • A patented combination of 3 proven weed killers.
Ortho 0204710 Killer WeedClear Weed Concentrate 32 oz
  • 32 oz
Tenacity Herbicide – 8 Ounces
  • Eliminates weeds at seedlings so new grass can flourish.
  • Brand name: Syngenta.
  • Made in United States.
Pramitol 25E Herbicide
  • 1 Gal
Roundup 1.33 gal. Ready-to-Use Extended Control Weed and Grass Killer Plus Weed Preventer Comfort Wand
  • 1.33 Gal
Monterey P – Turflon Ester Concentrate – 8 oz
  • 8 oz
Atrazine St.Augustine Weed Killer – 1 gal.
  • 2.5 Gallons
Pbi Gordon Trimec Lawn Weed Killer – 1 gallon jar
  • 1 Gal
Hi-Yield Atrazine Weed Killer (32 oz)
  • This selective weed killer controls Henbit, Clover, Chickweed and more. See label for full list.
  • Intended for use on St.
  • This 32 oz bottle of liquid concentrate weed killer can treat up to 3,720 sq. feet of lawn.
Pulverize 1 gal. Ready-to-Use Weed Brush and Vine Killer with Nested Trigger
  • Kills the toughtest weeds.
  • Roots and all!
  • Non staining.
Natria 706500A Control Grass & Weed Concentrate 32 oz
  • Non-selective control of listed grasses, weeds and Moss
  • Works fast See visible results in minutes
  • For use on patios, driveways, sidewalks and flower beds
Bonide 310 1qt Weed Beater Ultra Concentrate
  • 32 oz
Voluntary Purchasing Hi-Yield Killzall Weed & Grass Killer – 1 gal jug
  • 1 Gal
RM43 Total Vegetation Control – 2.5 Gallon
  • 2.5 Gal
1.33gal Roundup RTU Weed Killer
  • Kills weeds, won’t harm lawns
  • Kills crabgrass, dandelion, clover & yellow nut
  • Kills 253 types of weeds
Alligare 2,4 D Amine Herbicide 2.5 Gallon- Broadleaf Weed Killer
  • 2.5 Gallon
Gordon's Amine 400 2,4-D Weed Killer, 1 Gallon
  • 1 Gal
Roundup, 4375010 Killer Weed 1.25gal
  • Convenient, ready-to-use refill is easy to pour right into your Roundup for Lawns Extended Wand bottle-no mixing required
Southern Ag Lawn Weed Killer with Trimec – 0.474 L jug
  • For use on 9 turf types.
  • Controls a wide range of lawn weeds.
  • A patented combination of 3 proven weed killers.

1. Ortho 0204710 Killer WeedClear Weed Concentrate 32 oz

Ortho 0204710 Killer WeedClear Weed Concentrate 32 oz

  • 32 oz

Check Latest Price

Sold By Price
Amazon.com
Lowe’s
Blain’s Farm & Fleet
Rural King

Product Details

Specifications

Details
Brand Name Ortho
Primary Active Ingredient 2
Organic No
Product Form Concentrate
Rain Proof Yes

Reviews From Real Customers

ann0254

2. Tenacity Herbicide – 8 Ounces

Tenacity Herbicide - 8 Ounces

  • Eliminates weeds at seedlings so new grass can flourish.
  • Brand name: Syngenta.
  • Made in United States.
  • Assembly not required.

Check Latest Price

Sold By Price
Amazon.com – Seller
eBay
DoMyOwn.com
DIY Pest Control

Product Details

Specifications

Details
Kentucy bluegrass 5-8 oz
Centiepedegrass 5-8 oz
Tall Fescue 5-8 oz
Perennial ryegrass 5 oz
Fine Fescue 5 oz
St Augustinegrass 4 oz
Product Label Label(Same as 8 oz)
Active Ingredient (s) Mesotrione 40%
Retreatment twice on listed weeds as post-emergent treatment

3. Pramitol 25E Herbicide

Pramitol 25E Herbicide

  • 1 Gal

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Sold By Price
Amazon.com – Seller
Walmart
DoMyOwn.com
Agri Supply

Product Details

Specifications

Details
Product Form Concentrate
Container Size 32 oz
Coverage Area 2500 sq ft
Primary Active Ingredient 25% Prometon
Application Season Multi Season

4. Roundup 1.33 gal. Ready-to-Use Extended Control Weed and Grass Killer Plus Weed Preventer Comfort Wand

Roundup 1.33 gal. Ready-to-Use Extended Control Weed and Grass Killer Plus Weed Preventer Comfort Wand

  • 1.33 Gal

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Amazon.com
eBay
Walmart
Home Depot

Product Details

Specifications

Details
Weight 13.53 lb

5. Monterey P – Turflon Ester Concentrate – 8 oz

Monterey P - Turflon Ester Concentrate - 8 oz

  • 8 oz

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Amazon.com
eBay
DoMyOwn.com
DIY Pest Control

Product Details

Specifications

Details
Weight 0.65 oz

6. Atrazine St.Augustine Weed Killer – 1 gal.

Atrazine St.Augustine Weed Killer - 1 gal.

  • 2.5 Gallons

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Sold By Price
Amazon.com – Seller
DoMyOwn.com
Newegg.com – KH Online
RateKitchen.com

Product Details

Specifications

Details
Liquid Volume 3.79 Milliliters
Item Form Spray
Active Ingredients Atrazine
Product Dimensions 4.2 x 7.4 x 11.9 inches
Country of Origin USA

7. Pbi Gordon Trimec Lawn Weed Killer – 1 gallon jar

Pbi Gordon Trimec Lawn Weed Killer - 1 gallon jar

  • 1 Gal

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Sold By Price
Amazon.com
Walmart
Tractor Supply Company
Rural King

Product Details

Specifications

Details
Primary Active Ingredient 2
Product Form Concentrate
OMRI Certified No
Rain Proof Yes
Brand Name Gordon’s

Reviews From Real Customers

Dufus

8. Hi-Yield Atrazine Weed Killer (32 oz)

Hi-Yield Atrazine Weed Killer (32 oz)

  • This selective weed killer controls Henbit, Clover, Chickweed and more. See label for full list.
  • Intended for use on St.
  • This 32 oz bottle of liquid concentrate weed killer can treat up to 3,720 sq. feet of lawn.
  • For best results apply in early spring. Can be applied during both dormant and growing seasons.
  • Application varies by dimension and grass type. See label for application instruction.

Check Latest Price

Sold By Price
Amazon.com – Seller
eBay – 2000supplies
DoMyOwn.com
Solutions Pest & Lawn

Product Details

Specifications

Details
Product Form RTU Liquid
Container Size 32 oz
Coverage Area 3720 sq ft
Primary Active Ingredient Atrazine and Related Compounds
Application Season Multi Season

Reviews From Real Customers

Joanne
ronallen999

9. Hi-Yield 33692 Killzall Grass & Weed Killer Concentrate, 32 oz

Hi-Yield 33692 Killzall Grass & Weed Killer Concentrate, 32 oz

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Sold By Price
Amazon.com – Seller
eBay
Walmart
DoMyOwn.com

Product Details

Specifications

Details
Product Form Concentrate
Container Size 32 oz
Coverage Area 6400 sq ft
Primary Active Ingredient Glyphosate
Application Season Spring
Control Type Non-Selective
Pre/Post Emergent Post Emergent
Type of Weed Broadleaf Weeds
Application Location Lawn

10. Pulverize 1 gal. Ready-to-Use Weed Brush and Vine Killer with Nested Trigger

Pulverize 1 gal. Ready-to-Use Weed Brush and Vine Killer with Nested Trigger

  • Kills the toughtest weeds.
  • Roots and all!
  • Non staining.
  • works quickly / Kills the roots!
  • use anytime of the year.

Check Latest Price

Sold By Price
Amazon.com
Walmart
Home Depot
The BuildClub

Product Details

Specifications

Details
Concentrated or Ready to Use Ready to use
Application Type Spray
Emergent Type Post-Emergent
Compatible Grass Type Not for use on lawns
Application Method Spray

Reviews From Real Customers

Clyde O
Clyde O.

11. Natria 706500A Control Grass & Weed Concentrate 32 oz

Natria 706500A Control Grass & Weed Concentrate 32 oz

  • Non-selective control of listed grasses, weeds and Moss
  • Works fast See visible results in minutes
  • For use on patios, driveways, sidewalks and flower beds
  • Kills barnyard grass, chickweed, dandelion, kudzu, poison ivy, Clover, stinkweed and more
  • Kills roots Epa registered

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Sold By Price
Amazon.com
eBay
Ace Hardware
Valu Home Centers

Product Details

Specifications

Details
Targeted Weed Weed and Grass
Brand Name Natria
OMRI Certified No
Rain Proof No
Primary Active Ingredient 22.11 percent Ammoniated soap of fatty acids
Product Form Concentrate
Product Type Control
Pre/Post Emergent Post Emergent
Indoor/Outdoor Outdoor
Container Size 32 oz
Application Season Multi Season
Coverage Area 600 sq ft
Region Multi-Region
Type of Weed Multi-Weed
Control Type Non-Selective
Contact or Systemic Contact
Application Location Driveway/Patio
Organic No

12. Bonide 310 1qt Weed Beater Ultra Concentrate

Bonide 310 1qt Weed Beater Ultra Concentrate

  • 32 oz

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Amazon.com – Seller
eBay
Walmart – ProMax Commerce
Sears – zabiva

Product Details

Specifications

Details
Type of Weed Broadleaf Weeds
Product Form Concentrate
Restricted States AK
Organic No
Rain Proof Yes

Reviews From Real Customers

RL05
GmaBevh
Carly

13. Voluntary Purchasing Hi-Yield Killzall Weed & Grass Killer – 1 gal jug

Voluntary Purchasing Hi-Yield Killzall Weed & Grass Killer - 1 gal jug

  • 1 Gal

Check Latest Price

Sold By Price
Amazon.com – Seller
Walmart
DoMyOwn.com
Ace Hardware

Product Details

Specifications

Details
Indoor/Outdoor Indoor

14. RM43 Total Vegetation Control – 2.5 Gallon

RM43 Total Vegetation Control - 2.5 Gallon

  • 2.5 Gal

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Sold By Price
Amazon
eBay
Home Depot
Tractor Supply Company

Product Details

Reviews From Real Customers

gen2

15. 1.33gal Roundup RTU Weed Killer

1.33gal Roundup RTU Weed Killer

  • Kills weeds, won’t harm lawns
  • Kills crabgrass, dandelion, clover & yellow nut
  • Kills 253 types of weeds
  • Kills the root
  • Rainproof in 3 hours

Product Details

Specifications

Details
Product Form RTU Liquid
Pre/Post Emergent Post Emergent
OMRI Certified No
Application Season Multi Season
Container Size 1.33 gal

Reviews From Real Customers

Michael E

16. Alligare 2,4 D Amine Herbicide 2.5 Gallon- Broadleaf Weed Killer

Alligare 2,4 D Amine Herbicide 2.5 Gallon- Broadleaf Weed Killer

  • 2.5 Gallon

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Sold By Price
Amazon
eBay
Solutions Pest & Lawn
Keystone Pest Solutions

Product Details

Specifications

Details
Restricted Use No
Application Equipment Backpack Sprayer, Gloves, Pump Sprayer, Spray Rig
Active Ingredient Dimethylamine Salt of 2,4-D- 46.8%
Chemical Type Herbicide
Formulation Emulsifiable Concentrate (EC)

Reviews From Real Customers

Thom
Uday
Bryan

17. Crossbow Herbicide – 1 Gallon

Crossbow Herbicide - 1 Gallon

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Amazon
eBay – keystonepestsolutions
Forestry Distributing
Sunspot Supply

Product Details

Specifications

Details
Pet safe Yes, if used as directed on label

18. Gordon’s Amine 400 2,4-D Weed Killer, 1 Gallon

Gordon's Amine 400 2,4-D Weed Killer, 1 Gallon

  • 1 Gal

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Sold By Price
Amazon
Tractor Supply Company
Life and Home
DK Hardware

Product Details

Specifications

Details
Targeted Weed Weed
Type of Weed Broadleaf Weeds
Application Season Multi Season
Pre/Post Emergent Post Emergent
Each Weight 9.920 LB

Reviews From Real Customers

Jon200pa
Helpful Customer
ts public name sucks

19. Roundup, 4375010 Killer Weed 1.25gal

Roundup, 4375010 Killer Weed 1.25gal

  • Convenient, ready-to-use refill is easy to pour right into your Roundup for Lawns Extended Wand bottle-no mixing required
  • Kills over 250 weeds, including crabgrass, dandelion, clover, and yellow nutsedge-won’t harm your lawn
  • Lawn weed killer for use on Northern grasses, including Kentucky bluegrass, perennial ryegrass, fescue, bermudagrass, buffalograss, and zoysiagrass
  • Starts working immediately and rainproof in as little as 3 hours
  • For hard-to-kill summer crabgrass and grassy weeds, use Roundup for Lawns Crabgrass Destroyer

Product Details

Specifications

Details
Maximum Coverage Area 1250
Application Season All season
Pre-Emergent No
Concentrated No
Recommended for Algae No

Reviews From Real Customers

David64
roundup.com
Ratherhavefun

20. Southern Ag Lawn Weed Killer with Trimec – 0.474 L jug

Southern Ag Lawn Weed Killer with Trimec - 0.474 L jug

  • For use on 9 turf types.
  • Controls a wide range of lawn weeds.
  • A patented combination of 3 proven weed killers.
  • Directions for use in conventional & hose end sprayers CONTAINS: 5.

Product Details

Specifications

Details
Pet safe Yes, when used as directed on label
NOT FOR SALE TO CA,MA, MN
Coverage Area Up to 12,800 sq. ft
EPA Registration 2217-570-829

Reviews From Real Customers

wilhut6923
wi.stwst.fdh5su
gincody

Conclusion

Japanese knotweed is a highly invasive plant species that can cause significant damage to natural ecosystems. Herbicides are one of the most effective ways to control this plant. However, it is important to use the right herbicide and to follow all application instructions carefully to avoid harming other plants or animals.

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