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Average Rating

4.5 out of 5 stars Rating: 4.4

10 Reviews | 48 Q&A

Product Overview

Weedmaster is a post-emergent, selective herbicide that suppresses many different types of broadleaf weeds and brush. From chickweed to pigweed, this product controls more than seventy different weeds that would otherwise thrive in grass forages and crop rows. Using dicamba, Weedmaster retards the growth of the weeds, leading them to their death. Mix Weedmaster with the desired amount of water and spray it over the infested area. The application of surfactants, crop oil concentrates and low levels of liquid fertilizers can be mixed with Weedmaster to improve the control of post-emergent weeds.

Note: Due to New California State restrictions, this Can Not be Sold in California.

Features and Specs

Active Ingredient 2,4-D, dimethylamine salt 35.7%, Dicamba 12.4%
Target pests Chickweed, Flixweed, Henbit, Knotweed, Morningglory, Pigweed, Purslane, Ragweed, Sedge, Sunflower, Thistle, Dandelion, Poison Ivy, Nightshade, Redvine, Smartweed, Sowthistle, Leafy Spurge, Thistle
* See label for complete list
For use in Grass Forage, Conservation Reserve Program Land, Rangeland, General Farmland, Fallow Land and Crop Rows
Application 0.5 - 6 pints per 5 - 40 gallons of water per acre of application
* Use a Surfactant to Increase Effectiveness
* See label for complete application instructions
Pet safe Yes, if used as directed on label
Formulation Professional Product
LA, NM, TX, VT, WA (Restricted To Licensed Applicators Only)
Shipping Weight 25.25 lbs
Manufacturer Nufarm
UPC 191662012248
EPA Registration 71368-34


Weedmaster Target Pests

Spotted beebalm, broomweed, wild buckwheat, buffalobur, burdock, buttercup, common chickweed, cow cockle, common cocklebur, plains coreopsis, wolly croton, devils-claw, dogfennel, evening primrose, flax, annual fleabane, flixweed, henbit, knotweed, kochia, common lambsquarters, common mallow, marestail, morningglory, mustard, pennycress, virginia pepperweed, pigweed, poorjoe, common purslane, ragweed, lanceleaf western, sedge, sheperdspurse, pennsylvania smartweed, bitter sneezeweed, sowthistle, sunflower, russian thistle, velvetleaf, field bindweed, bittercress, buckeye, bullnettle, chicory, bur clover, common dandelion, southern dewberry, curly dock, elderberry, Missouri goldenrod, Common goldenweed, Texas groundsel, hairy honeysuckle, Carolina horsenettle, poison ivy, knapweed, marshelder, mesquite, milkweed antelopehorn, nightshade, eastern persimmon, prickly lettuce, rabbitbrush, tansy ragwort, redvine, fringed sagebrush, smartweed, red sorrel, sowthistle, leafy spurge, chinese tallow tree, thistle, hairy vetch, yankeeweed, yellow starthistle.

Types of Weedmaster Application

Keep Weedmaster away from open water and avoid applying the product to areas that treated water might run into the water table. You can apply Weedmaster through ground application, banded and broadcast, spot treatment, and aerial applications.

5 stars   6
4 stars   3
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2 stars   1
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Review Search   
Sort Reviews
  • 4 of 5 Stars

    Horse Pasture Use

    By Natalie on 06/28/2016

    I bought this product after long and extensive research regarding what broad lead herbicide I could safely put down on my active pasture. Two components of this product I really like is that you do not have to pull horses off unless you have broodmares about to or with foal. The second item is that manure and/or compost from horses grazing on treated pasture can be used for flower or vegetable gardens without residual damage. Alsike clover was my target with this application. It took a while to be affected. Broadleaf weeds, like plantain, were the first to take the hit. I'm happy with this product so far and will see how my pastures look come next summer.

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    33 of 36 people found this review helpful

  • 2 of 5 Stars

    Milkweed control

    By Larry on 07/22/2018

    I bought Weedmaster to specifically kill off a two acre pasture of milkweed, as well as other weeds. I sprayed the entire pasture - after about 10 days I mowed the field. After another 10 days we finally got a good rain, and overnight the milkweed are already several inches taller than the surrounding grasses. Too early to tell how the Weedmaster did on the other weeds.

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    12 of 19 people found this review helpful

  • 5 of 5 Stars


    By Ken on 09/28/2016

    Fast delivery and product works very well.

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    7 of 9 people found this review helpful

  • 5 of 5 Stars


    By Dianna on 06/01/2018

    I've been doing business with DMO for quite a while and have never been unhappy. Products are always in stock, prices competitive, Shipments / delivery as stated.

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    7 of 8 people found this review helpful

  • 5 of 5 Stars

    Pasture weeds

    By Leon on 09/24/2021

    It worked great! Killed the weeds and left the grass alone. Killed a broad spectrum of weeds.

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    5 of 5 people found this review helpful

See all 10 customer reviews

Questions & Answers

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Following application of Weedmaster, how long until it is rain safe?

Irrigation or rainfall within 4 hours of post emergence application of Weedmaster may reduce the effectiveness of the product.

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162 of 171 people found this answer helpful

How hot can it be before you need to stop spraying Weedmaster?

Weedmaster should be applied when temperatures are between 65-85 degrees.  

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155 of 156 people found this answer helpful

What is the re-entry period for people and dogs in an outdoor area after using Weedmaster?

As long as you keep pets/children out of the area while you treat and until the product has had time to completely dry or settle it is safe for pets and people to return and resume normal activity

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152 of 158 people found this answer helpful

How long does it take for weedmaster to dry or settle after application?

Weedmaster will dry within about 4 hours after application. Safe for children and pets after dried. 

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114 of 120 people found this answer helpful

How long do horses need to be off a pasture after it's been sprayed with WeedMaster?

According to the product label, people and animals may return to treated areas once the Weedmaster has had time to completely dry.

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96 of 100 people found this answer helpful

See all 48 customer questions

Weedmaster 4.5 out of 5 stars Rating: 4.4 (10 Reviews / 48 Q&A)

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