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

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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05/21/2017 Gail from Portland, Or

QHow soon can I plant annuals in a bed that has been treated with Casoron 4G Herbicide?
The emerging chrysanthamum and rhubarb are dying back. Will they survive?


The†product label†for†Casoron 4G Herbicide†specifically states, "Do not plant or transplant into treated soil." You should apply Casoron only around established plants and transplants as directed on the product label. We would recommend waiting at least one year before transplanting into areas treated with Casoron unless otherwise specified for particular plants elsewhere on the label.

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05/09/2017 Cindy from Auburn, Wa

QIf Casoron was put on our front lawn, is there any way to reverse the dying grass?
If not what steps do we take to get the lawn back?


Since Casoron 4G Herbicide was applied to the whole lawn, it will likely stay there for at least a year so you will not be able to reseed until next year. If you have any additional questions, we would recommend contacting the manufacturer directly. Their phone number is 800-423-8569.

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04/26/2017 Mike from Spanaway, Wa

QWiill Casoron 4G Herbicide kill grass that is already established?


Casaron 4G Herbicide shouldn't kill established grass. However, we would recommend you using it in a small test area first just to be sure before using it as an entire broadcast over your enitire lawn. You could also contact the product manifacturer Chemtura at 800-423-8569 to get a more definitive answer.

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04/26/2017 Peter from Europe

QI have been advised that Casoron 4G Herbicide will kill blanket weed in my koi pond without harming fish. Is this true?


No, Casaron 4G is NOT labeled to be used as an aquatic herbicide and will kill any aquatic life in your pond.†Unfortunately we do not carry an algaecide to be used in small koi ponds. We recommend that you talk to a local koi pond supplier.

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04/17/2017 Linda from Aloha, Or

QFor how long is soil contaminated for food plants after Casoron application?
My neighbor applied Casoron in his yard last fall. Consequently, my raspberry bushes died for 4-6 feet from the fence line. Is it safe to eat raspberries this year from remaining plants? How soon can I replant in that area?


Casoron 4G Herbicide†is actually labeled to be used around established raspberries so it would be fine around any that survived and bears fruit. †Since it can stay in the soil for at least 1 year, you would need to wait at least one year after application to replant or remove the treated soil and replace with new.

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03/29/2017 Wanda from Klamath Falls

QWill Casoron 4G Herbicide kill Mediterranean Sage?
I have a terrible Mediterranean Sage problem have tried commercial Roundup, Crossbow, and Pendulum and it keeps coming back. Any suggestions?


Casoron 4G is not labeled for Mediterranean sage at all.† We are not aware of any pre-emergents that are labeled for use on sage to prevent it from coming up or coming back.† Most applications are done with a post-emergent herbicide that is used throughout the growing season to control it as it comes up.† A product like Gordons Pasture Pro is labeled to control Mediterranean sage and can be used at up to 2 oz per gallon of water.† Gly Pho-Sel Pro Dry 75 also lists sage in general on the label and can be used per the label at up to 7 oz per gallon. Gly Pho Sel is one of the highest percentage glyphosate (Roundup-type) products on the market but it is a non-selective herbicide so you will want to be careful with application if desirable vegetation is nearby.†

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