Grass Out Max (Clethodim Herbicide)

$24.58 - $102.90

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3.5 out of 5 stars Rating: 3.7

21 Reviews | 63 Q&A

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{ $37.11 { $35.85 $24.58 $20.99 $102.90 $100.90
  Size/Description Price/Ea. Qty
Grass Out Max (Clethodim Herbicide) quart (32 oz)

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$37.11
Grass Out Max (Clethodim Herbicide) - pint pint (16 oz)

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$24.58
Grass Out Max (Clethodim Herbicide) - gallon gallon (128 oz)

Buy 1: $102.90 each

Buy 2 or more: $100.90 each

$102.90
Total Price: $0.00


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For large order quotes, please call us at 1-866-581-7378.

Grass Out Max (Clethodim Herbicide)

Compare to Select 2EC and Arrow 2EC Herbicide. With Grass Out Max you get the same active ingredient for less expense.  It is highly recommended that you use a surfactant with this product. 

Grass Out Max is a selective post-emergent herbicide used to control annual and perennial grasses. It is labeled for most landscape, home and garden, ornamental, agricultural and non-crop uses. The unique feature of Grass Out Max is that it will ONLY kill grasses and NOT effect flowers, shrubs, broadleaf crops or other broadleaf plants. Grass Out Max contains 25.4% Celthodim Herbicide and effectively kills more than 50 different grasses.

Grass Out Max is only labeled for use on clover when used in the states of Idaho, Oregon, and Washington.




Ground Application

Use a minimum of 5 gallons and maximum of 40 gallons of spray solution per acre. Use of sufficient spray volumes and pressure is essential to ensure complete coverage.

Under the following conditions a minimum of 10 gallons per acre is required: narrow row soybeans, broadleaf herbicide tank mixes, perennial grasses, volunteer corn, drought or stress conditions heavy grass pressure or when grasses are at or near maximum height. Failure to use a minimum of 10 gallons per acre under these conditions can result in poor coverage and reduced grass control requiring repeat applications. Spray pressures should reflect a minimum of 30 psi and a maximum of 60 psi at the nozzle. Do not use flood nozzles.

Applications to onions (dry bulbs and green), garlic, and shallots (dry blubs and green) should be made in a minimum of 20 gallons of spray solution per acre.

Rating Snapshot

5 stars   12
4 stars   2
3 stars   1
2 stars   1
1 star   5

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Average Customer Rating
3.5 out of 5 stars (21)

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Most Helpful Customer Reviews
  • 20 of 21 people found this review helpful:

    4 of 5 stars  Good grass killer
    By Joseph in Saint Johns on 08/04/2014
    Verified Purchase

    I purchased this product to use on my food plots. It arrived timely, and I mixed the product with 2.5 oz per gallon of water. I mixed in some sticker as indicated, and used a backpack sprayer to apply. I didn't see any immediate action (first couple of days) but finally noticed that it was working. It took out the crab grass in my clover field without harm to the clover. My plots are about 1/3 acre; I would suggest that you map out a route to insure complete coverage if you use hand sprayer like I did, as I missed a few spots do to walking deviations. I recommend this product for use in food plots.

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  • 18 of 25 people found this review helpful:

    2 of 5 stars  Grass Out Max
    By Mike in Charlotte, MI on 06/20/2012
    Verified Purchase

    I have used other products of this type meant specifically for grass eradication and this product was the least effective.

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  • 14 of 15 people found this review helpful:

    5 of 5 stars  Takes Patience, But Very Effective
    By Happy in Utah on 09/29/2012
    Verified Purchase

    We have about 12000 square feet of lawn with curbing and beds throughout. Kentucky bluegrass creeping into the groundcover of the beds used to be a real problem. Then my neighbor introduced me to to Grass Out Max. He had used it the previous fall and his beds look great. He said it took about a month for it to work. I tried it and it and for the first couple of weeks didn't see much difference, but after a month it did the trick. Now just an occasional touch up application keeps the beds looking good.

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  • 9 of 9 people found this review helpful:

    1 of 5 stars  grass out
    By Rusty in los Angeles CA on 01/12/2015
    Verified Purchase

    I don't think the product works. I have applied it twice and at this point no action. unless it kills the grass soon it was wasted money.

    Expert Response   Expert response:
    What kind of plants are you trying to kill, and around which desirable plants? This product should be used with a surfactant, so you will only see limited results if you have applied it without adding a surfactant/spreader sticker to your diluted solution. You may also see limited or slower results during this time of year since the grass should be actively growing in order to absorb the herbicide. We would be happy to troubleshoot with you via email or via telephone at 866-581-7378 9a-5p EST.

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  • 7 of 8 people found this review helpful:

    5 of 5 stars  Grass Out Max
    By Jon in Pennsylvania on 09/09/2013
    Verified Purchase

    I'm very pleased with the product. Grass out max work as advertised. Definitely will purchase again and will try other products.

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Most Recent Customer Reviews
  • 0 of 1 people found this review helpful:

    1 of 5 stars  Grass out max
    By John in Rhinebeck New York on 08/30/2017

    Do waste your money. I put to much down and still did not work

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  Great product
    By Andrew in Purcellville, VA on 08/04/2017

    This product does what it says! Kills grass and nothing else. My strawberry patch is happy!

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  • 5 of 5 stars  Grass out max
    By Jason in Laura, IL on 07/21/2017

    Shipping could not have been faster!! I applied grass out max at 16oz per acre with surfactant on my clover. Seven days later grass turned yellow three more days it was dead.

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  • 0 of 1 people found this review helpful:

    5 of 5 stars  nice
    By Ddwag in West lafayette, in on 07/08/2017

    got r dun, killed the grass near my maters

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  • 3 of 3 people found this review helpful:

    3 of 5 stars  Grass Out Max
    By Betty in Salt Lake City on 06/01/2017

    I barely applied the product and cannot say yet how effective it is. The product information booklet is extensive, but never states how many ounces to a gallon sprayer for use in home perennial beds. It says 8 oz. for an acre. I am guessing 1/2 oz./gallon for home use, but guessing is uncomfortable.

    Expert Response   Expert response:
    Thank you for your review. I apologize that the label is extensive and confusing. We recommend using a surfactant like Non-Ionic Surfactant to help increase the efficacy of this product. If you use the surfactant, the recommended mixing rate for one gallon would be 2 tsp of surfactant with approximately .4 oz of the Grass out per gallon of water per 1,000 sq feet. Please let us know if you have any other questions.

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  • 0 of 1 people found this review helpful:

    1 of 5 stars  food plot grass
    By Bill in Kaiser, MO on 03/30/2017

    Bought this last winter so I'd have it when warm weather hit and the grass started growing again, Grass has been growing for about 1 month now, sprayed 3 times and grass is still green and going strong. I won't say don't buy this product because it might work for you, but I wouldn't buy it again or recommend it . Its been a waste of my time and money.

    Expert Response   Expert response:
    Thank you for your comments! You did not mention whether you used a surfactant when applying the Grass Out Max. You are very unlikely to get satisfactory results using Grass Out Max or other clethodim products with the addition of a surfactant, such as Southern Ag Non-Ionic Surfactant for Herbicides: http://www.domyownpestcontrol.com/nonionic-surfactant-for-herbicides-p-1771.html We appreciate your feedback and your business!

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  • 2 of 2 people found this review helpful:

    5 of 5 stars  Worked like a charm!
    By Clay in New Salisbury, IN on 08/25/2016

    I was a slight bit biased on purchasing Grass Out Max when comparing the price to the other big names out there. I thought it was worth a shot for controlling the grass takeover in my strawberry bed. One application on a dry hot day was all it took! Less than a week and the color turned and all the grass was dead.

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  • 1 of 7 people found this review helpful:

    1 of 5 stars  Didn't work for me.
    By Robert in Kansas City on 08/24/2016

    Save your money.

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  • 4 of 5 stars  Pretty Good
    By K in Pikevill, KY on 07/13/2016

    I wasn't sure how well this would work. Killed the grass in the wife's flowers and in a patch of crimson clover. It took about two weeks to start seeing results. Everything looks pretty good. Product arrived quick.

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  • 0 of 2 people found this review helpful:

    1 of 5 stars  Didn't touch my problem
    By Brian in Lomira, WI on 06/16/2016

    My soybeans are being overtaken by grass. I tried spraying twice and this stuff hasn't worked at all.

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Most Helpful Q&A's

08/08/2011 Kim from Knoxville Tn

QWhat is the mixing ratio of Grass Out to water for spraying flower beds?
I'm using Grass Out Max in a gallon sprayer for flower beds. In reading the labels, I can't find what amounts of grass max/water to use for that size container. Could you please give me that information?

AYou will need to use 0.2-0.4 fl oz of Grass Out per 1,000 sq ft area. Like most other herbicides the exact amount of water you use is not important, it is just important to make sure you get the specified amount of product over a 1,000 sq ft area. For ease of mixing/measuring you can add the specified amount of product to 1 gallon of water to apply to a 1,000 sq ft area.

20 of 64 people found this answer helpful.
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05/07/2014 Therese from Swanton, Ohio 43558

QI purchased 'Grass Out' from you and it recommends adding a non-ionic surfactant,
I need to know how much to use of the Grass Out and the Surfactant. Do you mix it together and what is the percentage of each. Thank You.

AIf you are using Non Ionic Surfactant you would mix 2 tsp per surfactant with approx. .4 oz Grass out in one gallon water over 1000 sq feet. Please let us know if you have any more questions.

12 of 14 people found this answer helpful.
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06/17/2014 Roy from Metairie, La.

QDo I need to add ammonia sulfate when mixing with hard water?
There's a reaction when mixing glysophate with hard water that stops it from working. Ammonia sulfate stops this reaction. Is grass out act similar to glysophate when mixing with hard water?

AThe active ingredient in Grass Out Max, Clethodim, is not generally affected by hard water, so you should not need to use water additives. However, if the pH level of your water is higher than 7, then you may want to decrease the pH level for best results.

6 of 7 people found this answer helpful.
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07/11/2011 Jeff

QCan Grass Out Max be used on clover without killing it?

AThe product label for Grass Out Max does say it can be used on clover, but only in the states of Idaho, Oregon, and Washington.  We are not sure exactly if you live in these states. Please refer to the label for specific application instructions.

6 of 12 people found this answer helpful.
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05/24/2016 D from New Market, Va

QHow long does it take before the grass dies with Grass Out Max?

A

You would see results with Grass Out Max within 10-14 days.

5 of 5 people found this answer helpful.
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Most Recent Customer Questions

11/19/2017 Maura from Los Angeles, Ca

QWill Grass Out Max work to remove grasses from ivy ground cover?
We have a lot of tall grass growing up through ivy ground cover. We want to keep the ivy but kill the grass.

A

Yes, Grass Out Max Herbicide is safe to use in established English Ivy for control of grassy weeds. Please refer to the product label for complete application instructions.

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10/27/2017 Peggy from California

QCan Grass Out Max be used to control bermuda grass in flower beds?

A

Yes,†Grass Out Max can be used to control bermuda grass in flower beds.†

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10/25/2017 Nick from Louisiana

QCan Grass Out Max be used on a centipede lawn to control bermuda and torpedograss without harming the centipede?

A

Grass Out Max is not labeled as safe to be used on Centipede lawns nor is it labeled to target torpedograss. Bonide Grass Beater Over the Top Grass Killer, however, is labeled for use on centipedegrass and will target bermuda and torpedograss, as well as many other grass species.†

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10/16/2017 Larry from Gainesville, Tx

QWill Grassout Max control Dallisgrass?
I have several spots of Dallisgrass and Sandburrs in my buffalo grass pasture. Will Grass Out control my problem?

A

Grass Out Max (Clethodim Herbicide)†is not labeled to control dallisgrass and would harm the buffalograss when used for sandburs since†it is a grass killer.† It is not labeled for use in grass pastures and would not be recommended.

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09/11/2017 Jared from Austintown, Oh

QIs Grass Out Max safe for myrtle?

A

Yes, Grass Out Max is safe to apply around myrtle.

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08/25/2017 Cole from Wolcott, Ny

QHow much Grass Out Max do you mix in 1 gallon water? Does .4 mean 4 ounces?

A

You will need to use 0.2-0.4 fl oz of†Grass Out†per 1,000 sq ft area. †0.4 f oz is less than 1/2 oz, so not 4 ounces. Like most other herbicides the exact amount of water you use is not important, it is just important to make sure you get the specified amount of product over a 1,000 sq ft area.

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08/25/2017 Danny from Indianapolis, Indiana

QWhat are the treatment intervals when using Grass Out Max (Clethodim Herbicide)?

A

When using†Grass Out Max (Clethodim Herbicide)†the application interval all depends on where†you are applying the product. Please review page 9 of the†product label.

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07/31/2017 Agge from Youngsville

QHow do you convert fluid oz. per acre for Grass Out Max?
I purchased Grass Out Max to treat goose grass in my yard however the application instructions only indicate fluid oz. per acre. How do I convert that so I can use the appropriate mixture in a 1 to 2 gallon tank sprayer?

A

Herbicides are a lot different than other concentrated products and can be hard to understand at first. The application rate depends on the speed at which you apply the product and the output of your sprayer. The amount of water used to apply Grass Out Max herbicide is not critical, but should be sufficient for uniform coverage of the target area. Calibrate by determining the volume of water required to treat 1,000 square feet. Use this calibration volume to determine the amount of water and Grass Out Max herbicide needed to treat the target area (see the following calibration example). Note: Sprayer calibration (volume of spray needed to treat 1,000 square feet) will vary with each individual operator.

Steps in Calibration:
1. Mark an area of 1,000 square feet (i.e. 20 by 50 feet or 25 by 40 feet).
2. Place the sprayer on a level surface and add water noting the final level of water in the spray tank.
3. Spray the marked area with a sufficient volume of water to provide uniform coverage. Refill the sprayer to the same level as before measuring the amount of water added. The measured water added to the sprayer is the volume needed to cover 1,000 square feet.
4. Determine the application rate (0.073- .55 fl. oz./1,000 sq. ft.) for Grass Out†from the Recommendations section of this label.
5. To each volume of water used as measured in step 3, add the amount of Grass Out as determined in step 4.

Example: If the sprayer uses 1 gallon†of water to cover 1,000 square feet and the desired application rate of Grass Out†is .55 fluid oz./1,000 square feet, then you would add .55 fluid ounces of Grass Out†to every 1 gallon of water to be used.

Grass Out Max per the product label is for use at the rate of 8 - 16 oz per acre to control goosegrass. So thats 0.18 - 0.36 oz per 1000 sq/ft mixed into the water volume you calculated from the test above. Grass Out Max also requires the use of a Non Ionic Surfactant which you will use at its labeled rates which are normally close to 1-2 teaspoons per gallon of water.†

Keep in mind: Grass Out Max should NOT be used on home lawns or any areas where there is desirable turf grass. This is a GRASS killer and is to be used to remove grasses of almost every type from ornamental beds, around flowers and other labeled tolerant areas.†

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07/22/2017 Kris from Knightdale, Nc

QHow much Grass Out Max should I use per gallon of water to control poa annua?
I would like to kill poa annua in my Bermuda grass lawn.

A

Grass Out Max (Clethodim Herbicide)†can eradicate Bermuda and Poa Annua.†Revolver Herbicide†is a post-emergent herbicide†that is labeled to kill poa annua in Bermudagrass. Be sure to apply this product in temperatures above 60 degrees Fahrenheit. The mixing ratio is 0.2-0.4 fl. oz. per 1000 square feet. This will generally mix in a gallon of water.

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07/10/2017 Chris from Lumberton

QWill Grass Out Max (Clethodim Herbicide) hurt my peanuts?

A

No,†Grass Out Max (Clethodim Herbicide)†will not harm peanuts; this product can safely be applied over peanuts in accordance with the product label.

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