Grass Out Max (Clethodim Herbicide)
Customer Reviews

Rating Snapshot

4.2 of 5 stars (110)
4.2 out of 5 stars
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255 of 275 people found this review helpful:

Grass Out Max
3 of 5 stars
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. …

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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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142 of 149 people found this review helpful:

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

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…

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80 of 84 people found this review helpful:

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

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 G…

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61 of 66 people found this review helpful:

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

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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35 of 58 people found this review helpful:

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

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

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24 of 25 people found this review helpful:

Grass out max
5 of 5 stars
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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21 of 22 people found this review helpful:

Worked great on Wildflower Garden
5 of 5 stars
By Steve in Bristol, Michigan on 06/02/2016

I have two large wildflower gardens that were getting overrun by grasses of all kinds. I was real close to tilling everything in and starting over. I am so glad I tried Grass Out Max first. It takes a…

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21 of 21 people found this review helpful:

Resurrected food plot
5 of 5 stars
By Les in Bathgate, ND on 06/05/2016

followed recommended dosage on 1 acre alfalfa food plot that grass was threatening to take over. after only about 5 days grass going, going, and a few more days gone! Alfalfa came back strong and look…

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16 of 18 people found this review helpful:

Great product
5 of 5 stars
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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15 of 17 people found this review helpful:

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

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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11 of 12 people found this review helpful:

food plot grass
1 of 5 stars
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 stron…

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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 without 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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9 of 9 people found this review helpful:

Pretty Good
4 of 5 stars
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 …

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8 of 8 people found this review helpful:

Grass out max
5 of 5 stars
By Mark in Saint Albans on 05/23/2018

I mixed the product with the recommended surfactant at the specified rate and got excellent results. There was no effect on my peonies and Japanese irises.

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8 of 9 people found this review helpful:

Time saver
5 of 5 stars
By Jeff in Jennings, La. on 07/06/2018

I used to spray mixed clover food plots. Mixed as per instructions using suggested oil to help aid in contact. Works well. Have patience it will not kill overnight. Takes about 12 day's and grass in c…

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8 of 8 people found this review helpful:

grass killer
5 of 5 stars
By Bruce in Marion Il. on 08/30/2019

I used clethodem as directed on the label and it worked great. The annual grasses were dead within 2 weeks,the tough perennial grasses such as mature fescues and Bermuda will get a second treatment. T…

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7 of 10 people found this review helpful:

Grass Out the best!!
5 of 5 stars
By Dave in MN on 08/26/2015

Use this on my berries. It works the best without harming the berry plants. Ultra fast delivery and great customer service.Gets rid of all that pesky grass.

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7 of 10 people found this review helpful:

Wonderful!
5 of 5 stars
By Carrie in Decatur on 04/09/2016

This really worked great in my bed. It killed the weeds but not my plants.

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7 of 9 people found this review helpful:

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

got r dun, killed the grass near my maters

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7 of 7 people found this review helpful:

First experience with Grass Out Max
5 of 5 stars
By Danny in caraway arkansas on 06/26/2020

Being new to this product I was a little concerned (a lot concerned) about spraying my tomatoes wit this product but I give it a try. The first one I used it I only sprayed 1 row of tomatoes and was c…

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5 of 6 people found this review helpful:

Grass Out Max got the grass out
5 of 5 stars
By Steve in Rossville, TN on 06/01/2016

Product worked as promised and did NOT harm my sunflowers!

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5 of 5 people found this review helpful:

Grass Out Max got the grass out
5 of 5 stars
By Steve in Rossville, TN on 06/01/2016

Product worked as promised and did NOT harm my sunflowers!

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5 of 6 people found this review helpful:

Worked like a charm!
5 of 5 stars
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. …

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5 of 5 people found this review helpful:

Works great!
5 of 5 stars
By Karen in Mohnton, PA on 06/14/2018

We had a nasty patch of quackgrass that pretty much took over our small strawberry patch. This product worked like a charm but took 2 weeks, so you must be patient. It did not kill the strawberry plan…

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5 of 6 people found this review helpful:

Really works!
5 of 5 stars
By Julie in Corder Missouri on 06/26/2018

I had grass taking over my flower bed. It took two applications but it did the job and my flower bed is rescued!

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5 of 5 people found this review helpful:

Works great on Kentucky Bluegrass
5 of 5 stars
By Jim in Fort Wayne, IN on 06/15/2020

I have a bed of Euonymus ground cover in front of my home. My Kentucky Bluegrass lawn had invaded the bed and I had tried all kind of grass killers to get rid of it and not damage the Euonymus. The o…

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5 of 5 people found this review helpful:

Looking Good
5 of 5 stars
By James in Fruitland Park, Florida on 07/24/2020

Although we been having lots of rain in Florida, I mixed and sprayed the grasses growing up through out ground cover beds. That grass is turning brown now and our landscape plants were not affected. I…

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4 of 4 people found this review helpful:

Great for orchards and berry plantings
5 of 5 stars
By Jane in SE Oklahoma on 04/19/2019

Grass Out Max is just the tool we were looking for! In a new orchard planting that was previously hay field we had tons of grass intrusion even after getting a strong initial kill before planting. S…

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4 of 4 people found this review helpful:

WORKS GREAT
5 of 5 stars
By Daren in Snohomish Washington on 06/20/2020

I followed directions exactly, I had grass in ornamental plants. In 2 weeks grass died, perfect, thanks.

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4 of 4 people found this review helpful:

You need to be patient
4 of 5 stars
By Jonathan in Elgin, IL on 07/03/2020

Use this to try to kill perennial rye and Kentucky bluegrass that was quite long. It took quite a while for it to work close to a month so it is a very slow process. You have to be patient with this p…

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3 of 4 people found this review helpful:

Works okay so far
4 of 5 stars
By John in Northwest Indiana on 05/25/2018

I have applied the Grass Out Max once so far. After a couple weeks I am seeing some evidence of it working. May apply it a second time.

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