Casoron 4G Herbicide


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5 out of 5 stars Rating: 5

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{ $109.00 { $106.21
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Casoron 4G Herbicide bag (25 lbs)

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Casoron 4G Herbicide

Casoron 4G is a selective pre-emergence herbicide that prevents many variety of weeds and grasses. Casoron 4G controls weeds before they emerge from the ground, by forming an herbicidal vapor barrier in the upper layer of the soil when activated by rainfall or irrigation water. Casoron 4G should be applied before weed seed germination and emergence from the soil (usually from mid-winter to early spring). A single application will usually provide season-long weed control.


Perennial Weed Control

Apply CASORON 4G as a soil surface treatment in late fall from November 15 to February 15. Old weed growth should not be removed before application. Do not make surface application to areas which have been cultivated during the fall or summer prior to application.

Annual Weed Control

Apply CASORON 4G either in early spring before seeds of annual weeds germinate or after cultivation has removed the growing weeds. Distribute granules uniformly over the soil surface. If treatment is followed by application of 1/2 to 1 inch of water by overhead irrigation, the lower rates are recommended. Shallow incorporation immediately after application is recommended in southern areas. In other areas, shallow incorporation or sprinkler irrigation is suggested when applications are made during periods of high temperature.

Nut Sedge Control

CASORON 4G can be used for control of nutsedge in non-crop areas only. Apply recommended rates and incorporate immediately to a depth of 4 to 6 inches. Seasonal control of annual weeds will also be obtained with this application.

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  • 5 of 5 people found this review helpful:

    5 of 5 stars  casoron 4G
    By Janice in Tacoma, Wa. 98443 on 05/21/2016

    Excellent product, must be very careful using it does kill everything once wet..

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  • 1 of 2 people found this review helpful:

    5 of 5 stars  5 stars for Casoron
    By Dorothy in Coarsegold, CA on 04/15/2017

    This was a gift sent to my son to rid the hill from weeds and having to maintain each spring, but I used this product in Montana when my home had small gravel surrounding it. Spread this all around as spring was arriving and NEVER were there any weeds growing all around my home or down the driveway. Everyone wondered how I did that!!

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Most Helpful Q&A's

02/28/2011 Ruth

QOur church has a gravel parking lot in AZ. What pre emergent can we use to prevent tumbleweeds from coming?

ACasoron Herbicide will be a good choice to control Russian thistle (aka tumbleweed). Treating gravel lots can be tough because it is hard to contact the soil and the soil is usually very dry. To help get the Casoron granules to the soil you must heavily irrigate the area after the application. Casoron is a mild soil sterilant, so it is very important not to put it in areas where it will contact desirable plants or in areas where you will soon want to grow new plants.

29 of 32 people found this answer helpful.
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04/23/2013 Eric from Milbrae Ca

QWill Casoron 4G kill ivy?

AYes, Casaron is labeled to treat Ivy. Please make sure to follow the label directions and also make sure to thoroughly water in after application to incorporate granules into soil.

17 of 17 people found this answer helpful.
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09/26/2014 Janie from Port Ludlow, Wa

QWe have a large yard. Is there a weed control product (Caseron) that lasts a year?
If so, which month is best to apply? The Caseron does not last an entire year. I know you need to put it down before the weeds begin to grow again, but I'm hoping we don't have to apply it twice a year. It sure helps prevent weeds growing; which saves on Roundup usage. Thank you for answering the question and any advice you might have.

AUnfortunately there is not a weed control like Casoron that will provide you year long prevention from weeds growing, the only products that provide year long control are bareground herbicides such as Pramitol. Casoron is labeled to give season long control, but you will need to reapply because it does not have and post emergent qualities. Dimension 2EW gives pre and post emergent control for labeled weeds.

12 of 14 people found this answer helpful.
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09/24/2016 Jc from Vancouver, Wa

QHow late in the year can I spread Casoron 4G Herbicide to be effective?


Casoron 4G Herbicide is a pre-emergent herbicide that would control weeds before they emerge from the ground†by forming an herbicidal vapor barrier in the upper layer of the soil when activated by rainfall or irrigation. We recommend that it should be applied before weed seed germination and emergence from the soil (usually from mid-winter to early spring).†

11 of 12 people found this answer helpful.
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10/19/2013 Fran from Leavenworth, Wa

QCan Casoron 4G Herbicide be used around established roses and ornamental grass

ACasoron 4G Herbicide would work great around the roses. We would not recommend to use it around ornamental grasses, because it could cause injury. Casoron 4G Herbicide works by causing "tissue damage" to the roots. Since, grasses are rooted shallow, this product could stunt the ornamental grass growth.

10 of 12 people found this answer helpful.
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Most Recent Customer Questions

11/05/2017 Beth from Alberta

QIf a few centimeters of snow has already fallen and temps are below zero, can you still apply Casoron?
We usually apply when a light layer of frost is on the shrub beds but no snow...this year we are later but now there is a layer of snow on the beds. Will it work it's way down or stay where it is until it thaws?


The snow has to thaw in order for Casoron 4G Herbicide to work. It will have to be reapplied and watered in if the snow does not thaw within 10 days of application.

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09/14/2017 Peggy from Roseburg, Or

QCan I apply Casoron 4G Herbicide in fall to prevent weeds from emerging in spring?
I would like to apply in fall and then plant my vegetables in spring (plants not seeds). Would this work to keep weeds from getting a head start? Would it be too harsh for the small vegetable starts?


The Casoron 4G herbicide product label states: Do not plant rotational crops, on which dichlobenil is not registered, in treated soil within one year of application. †It is not labeled to be used in soil where vegetables will be planted so we cannot recommend you do so. †For vegetable gardens we have the Monterey Vegetable & Ornamental Weeder†and the†Hi-Yield Herbicide Granules. †Please refer to each product label for complete list of plants it is safe to use with and the target weeds to determine which fits your needs.

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09/04/2017 Julie from Milton

QWhich should I buy for pre-emergent granules for a lawn of Perennial Ryegrass and Tall Fescue mixture?
Casoron 4G, Corral 2.68G or Pendulum 2G? I have all kinds of weeds- Southern DE. Type of lawn as stated above.


Casoron 4G Herbicide†is not labeled to be used in lawns so would not be recommended. ††Pendulum 2G and†Corral 2.68G†both contain the same active ingredient and would be comparable, really, as they are labeled for the same weeds.

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08/25/2017 David from Longview, Wa

QAfter I put down Casoron 4G Herbicide, how long do I have to wait before I can plant flowers in a treated area?


It is recommended that you wait at least four weeks before planting anything in an area treated with†Casoron 4G Herbicide.†

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08/12/2017 Morris from Chattanooga, Tn

QWill Casoron stop Dodder in English Ivy without killing the Ivy?


Casoron 4G Herbicide†will stop Dodder but English Ivy is not listed as tolerable.

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08/09/2017 Joette from Moses Lake, Washington

QFor how long are bags of Casoron safe to use?
My guess is they are about 15 years old -the number on the first one is 07082250


Casoron 4G has a shelf life of 2-3 years when stored at room temperature. We would recommend contacting the manufacturer Chemtura AgroSolutions at 678-502-4212 for more information on the number located on the bag.†

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06/22/2017 John from Stanwood, Wa

QHow soon can I plant after Casoron 4G Herbicide was applied?


You should not plant in the areas treated with†Casoron 4G Herbicide† for a minimum of one year from the application date.

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06/12/2017 Jason from Edmonton, Alberta, Canada

QAre you aware of any issues with using Casoron 4G Herbicide in tree grates?


We are not aware of Casoron 4G Herbicide being applied or having any issues around tree grates. We recommend that the product be applied to listed areas on the product label only for safety and the best results.

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06/04/2017 Connie

QI planted a few bushes, can I sprinkle Casoron 4G Herbicide around them?


Casoron 4G Herbicide† can be sprinkled around the bushes as long as they are established.

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05/25/2017 Tina from Estacada

QIs Casoron 4G Herbicide safe by rose bushes?


Casoron 4G Herbicide will not kill established rose bushes. Roses are listed as a tolerant plant.

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