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MONTEREY

Monterey Herbicide Helper

Monterey Herbicide Helper is a straightforward and effective surfactant that improves the performance and penetration of herbicides.

As low as $14.50
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Monterey Herbicide Helper Product Page
Min : 14.5 - Max : 16.99
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Price as of
11/04/25
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Monterey Herbicide Helper, manufactured by Monterey, is an efficient non-ionic and crop oil concentrate combination-based surfactant that gives the best and fastest weed control results with herbicides. 

One of the key benefits of this herbicide spreader and penetrator is its ability to enhance herbicide absorption into plants. Weeds often have a waxy surface that can repel certain herbicides, making it difficult for the chemicals to penetrate the plant tissue. Monterey Herbicide Helper acts as a surfactant, breaking down this surface tension and allowing the herbicide to adhere and move into the weed tissue more easily. 

Monterey Herbicide Helper helps herbicides, including non-selective herbicides, spread evenly across the entire weed surface, ensuring full plant coverage and reducing the odds of missed areas. 

Tools Needed

You can use a hose-end sprayer, backpack sprayer, handheld pump sprayer, spray rig, or other spraying equipment to apply this product with. 

How to Use

  • Step 1: Identify the treatment area and the herbicide you wish to mix Monterey Herbicide Helper with. Make sure you are using the appropriate herbicide for the weed you are trying to control and that it can be mixed with this product. Apply 2 tbsp. (1 fl. oz.) of Monterey Herbicide Helper in 3 to 5 gallons of mixed spray. 
  • Step 2: Prepare the selected herbicide according to its product label instructions. Add this surfactant to the mixed spray solution and agitate thoroughly. 
  • Step 3: Spray the herbicide mixed with the Monterey Herbicide Helper according to its product label instructions. Frequently shake the sprayer while spraying. 

Where to Use

Monterey Herbicide Helper can be used to control weeds on dry, land sites with selective and non-selective herbicides such as Poast Herbicide and Grass Getter. 

When to Use

Use this surfactant when you wish to increase weed control with your herbicide. 

Avoid using this product with selective herbicides when selectivity depends on not wetting the primary target. 

Safety Information

Monterey Herbicide Helper 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. 

Special Considerations

Not for aquatic use in Washington. 

AvailabilityOnline
Restricted UseNo
Shipping Restrictions
* = not registered** = restricted use
8 Ounce: AK*, AL*, AR*, AZ*, CO*, CT*, DC*, DE*, FL*, GA*, HI*, IA*, ID*, IL*, IN*, LA*, MA*, MD*, ME*, MI*, MN*, MO*, MS*, MT*, NC*, ND*, NE*, NH*, NJ*, NM*, NV*, NY*, OH*, OK*, OR*, PA*, SC*, SD*, TN*, TX*, UT*, VA*, VT*, WA*, WI*, WY*
16 Ounce: AK*, AL*, AR*, AZ*, CO*, CT*, DC*, DE*, FL*, GA*, HI*, IA*, ID*, IL*, IN*, LA*, MA*, MD*, ME*, MI*, MN*, MO*, MS*, MT*, NC*, ND*, NE*, NH*, NJ*, NM*, NV*, NY*, OH*, OK*, OR*, PA*, SC*, SD*, TN*, TX*, UT*, VA*, VT*, WA*, WI*, WY*
BrandMONTEREY
Keith's Pro Tips"It’s important to mix the solution thoroughly to ensure that the Monterey Herbicide Helper is evenly distributed throughout the spray solution. Proper agitation of the tank is essential for consistent application."
Product DrawbacksMonterey Herbicide Helper cannot be used for aquatic uses in Washington.
Target PestsWeeds
Application EquipmentBackpack Sprayer, Gloves, Pump Sprayer, Spray Rig
Application MethodsBroadcast Spray, Spot Treatment
Active IngredientPetroleum distillate 80.0% Alkyphenol ethoxylate 20.0%
Product TypeAdjuvant
FormulationSurfactant
Application RateApply 2 tbsp. (1 fl. oz.) of Monterey Herbicide Helper in 3 to 5 gallons of mixed spray. 
Shelf LifeMonterey Herbicide Helper will last for 3 years when stored in a dry, clean area.
Use SitesOutdoors
Time to KillMonterey Herbicide Helper will instantly mix with other herbicides.
EPA Registration #54705-50001-AA
More Information
Restricted Use No
Shipping Restrictions AK, AL, AR, AZ, CO, CT, DC, DE, FL, GA, HI, IA, ID, IL, IN, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NM, NV, NY, OH, OK, OR, PA, SC, SD, TN, TX, UT, VA, VT, WA, WI, WY
Availability Online
Signal Word CAUTION
Keith's Pro Tip "It’s important to mix the solution thoroughly to ensure that the Monterey Herbicide Helper is evenly distributed throughout the spray solution. Proper agitation of the tank is essential for consistent application."
Time to Kill Monterey Herbicide Helper will instantly mix with other herbicides.
Chemical Type Adjuvant
Formulation Surfactant
Application Methods Broadcast Spray, Spot Treatment
Product Drawbacks Monterey Herbicide Helper cannot be used for aquatic uses in Washington.
Active Ingredient Petroleum distillate 80.0% Alkyphenol ethoxylate 20.0%
Application Equipment Backpack Sprayer, Gloves, Pump Sprayer, Spray Rig
Mix Rate Apply 2 tbsp. (1 fl. oz.) of Monterey Herbicide Helper in 3 to 5 gallons of mixed spray. 
Use Sites Outdoors
EPA Registration No. 54705-50001-AA
Shelf Life Monterey Herbicide Helper will last for 3 years when stored in a dry, clean area.
Children or pets? No
Property Characteristics None

*Price does not include freight. We guarantee our rate plus shipping will be less than anyone else's price.

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