Tenacity Herbicide


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4.5 Rating: 4.5

54 Reviews | 85 Q&A 


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Tenacity Herbicide bottle(s) (8 oz)

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Tenacity Herbicide

Tenacity is a systemic pre-emergence and post-emergence herbicide for the selective contact and residual control of weeds in turfgrasses. When applied as a pre-emergent, weeds absorb Tenacity during emergence from the soil. Dry conditions following application may reduce the pre-emergence activity. If rainfall (0.15 inches) has not occurred within 10 days after a pre-emergence application, activate with 0.15 inches of irrigation. When used as a post-emergent, susceptible weeds absorb Tenacity through foliar contact and soil absorption. Foliage of treated weeds cease growth after application, then turn white (loss of chlorophyll) and death may take up to three weeks. A repeat application is required after two to three weeks for improved post-emergence weed control. A non-ionic surfactant should be added in post-emergence applications.

Active Ingredient: Mesotrione - 40%
Target pests: Barnyardgrass, Carpetweed, Chickweed, Clover, Crabgrass (large & smooth), Dandelion, Foxtail, Goosegrass, Henbit, Nutsedge, Purslane, Thistle, Wild Carrot and others
* See label for complete list
For use in: Kentucky Bluegrass, Centipedegrass, Buffalograss, Tall Fescue, Perennial Ryegrass, Fine Fescue, St. Augustine Grass
Application: 4 - 8 oz. per 30 gallons of water per acre
* See label for complete application instructions
Formulation: Professional Product
Group 27 Herbicide
Manufactured By: Syngenta

What makes Tenacity different than other currently used turf herbicides?

Tenacity is a selective, systemic herbicide that features a new mode of action for pre- and post-emergence grass and broadleaf weed control in several cool- and warm-season turf species—like keeping bentgrass out of your rough. Tenacity can also be applied on established or newly seeded turf.

How was Tenacity herbicide discovered?

A Syngenta scientist in California noticed that there were fewer weeds growing under his bottlebrush (Callistemon citrinus) plant, far fewer than can be explained by shading alone. He concluded that the plant must be producing allelochemicals to suppress weed competition. Syngenta synthesized mesotrione based on the allelochemicals produced by the bottlebrush plant.

What is the mode of action of Tenacity herbicide?

Tenacity inhibits a plant enzyme called HPPD that is essential to photosynthesis and prevents formation of carotenoids in susceptible plant species. Without carotenoids, light energy and by-products of photosynthesis will destroy chlorophyll and cell membranes. This results in bleaching of leaves followed by necrosis and death of the plant.

How quickly does Tenacity work?

Once absorbed, Tenacity quickly translocates throughout the plant. Weed growth is suppressed soon after application, as photosynthesis is disrupted. Death of the plant usually occurs within two to three weeks.

What are some of the unique benefits of Tenacity herbicide?

Tenacity has pre- and post-emergence activity on 46 dicot and monocot weed species. It can selectively control perennial monocots such as bentgrass and nimblewill and annuals such as crabgrass and goosegrass in many turfgrass species. Tenacity can be applied at the seeding to prevent weed germination and allow the turfgrass species to establish without weed competition.

Can Tenacity be used to get bentgrass out of roughs and fairways?

Yes. Tenacity selectively controls bentgrass out of Kentucky bluegrass, perennial ryegrass, and tall fescue turf.

What does it mean that Tenacity was granted reduced-risk status by the EPA? Why did Tenacity earn this status?

Reduced-risk is an EPA designated registration status that accelerates the process for registration of certain new plant protection products. Tenacity received reduced-risk status by the EPA based on its unique mode of action, low use rates, and favorable toxicity and human health profiles, as compared to other herbicides currently on the market.

On which grasses has Tenacity been tested for use at or prior to seeding?

Tenacity is safe for use at or prior to seeding on Kentucky bluegrass, tall fescue, perennial ryegrass, and centipedegrass. Application at seeding can be made to fine fescue only if it is less than 20% of a seed mixture.

Are there any grasses on which you can't use Tenacity?

Tenacity is not recommended for use on zoysiagrass, hybrid or common bermudagrass, seashore paspalum, or kikuyugrass.

Can Tenacity be tank mixed with other herbicides?

Tenacity can be tank mixed with Barricade, dicamba, carfentrazone, triclorpyr, atrazine, simazine, s-metolachlor, bentazon, and several three-way phenoxy herbicides. Combinations can help turf managers broaden the weed control spectrum or improve the level of weed control over single-product applications.

How rainfast is Tenacity?

Tenacity is rainfast within several hours under normal rainfall conditions.

What other brands currently on the market offer a product similar to Tenacity?

There are currently no other herbicides like Tenacity for golf courses and sod farms registered for use or sale in the U.S. Tenacity will compete with multiple products from different classes of chemistry.

Rating Snapshot

5 stars   37
4 stars   10
3 stars   6
2 stars   0
1 star   1

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Average Customer Rating
4.5 star rating (54 reviews)

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Most Helpful Customer Reviews
  • 53 of 56 people found this review helpful:

    5 of 5 Stars  Tenacity Herbicide
    By Frank in Johnston, IA on May 7, 2012
    Verified Purchase

    I had a lot of weed grasses in my yard and they were invasive and spreading over the whole yard. Tenacity targets weed grasses and kills them while leaving the rest of the yard in tact and that is exactly what it did. All of my weeds are dying. One thing you must note is that this herbicide needs to be watered after it dries on the plant so that the plant takes it in. It will not work if you just spray it on and don't get rain or water it for a couple of weeks. It's pricy but I know of no other chemical that will kill weed grasses and leave what you want, alone.

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  • 39 of 39 people found this review helpful:

    5 of 5 Stars  A Miracle Herbicide!
    By Margaret in Scarsdale, NY on August 14, 2012
    Verified Purchase

    I had a lawn that was completely taken over by bentgrass. I used round up on the lawn and put in an entire new lawn. All was well for a year or two. Then the the bentgrass came back in a few isolated areas. I would have to round them up at the end of the season and reseed. This went on for a number of years. When I learned about Tenacity I was thrilled and gave it a try. It works wonderfully! Yes it is pricy, however it beats having to round up the bentgrass, clear it out, put down more top soil and reseed. Try it...you won't be disappointed.

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  • 28 of 32 people found this review helpful:

    5 of 5 Stars  Great product! Does exactly what it advertises!
    By Debi in Toledo, Ohio on September 7, 2012

    My mom completely re-sodded front and back lawns and within 3 years it had been invaded by bentgrass. My new lawn was hydro-seeded 5 years ago in a new subdivision that used to be a golf course. Our methodology was to use Roundup in the fall (when the bent grass really seems to take off in growth) and then reseed the large killed off areas, hoping that the Roundup did a thorough job in killing the bentgrass. This becomes very tedious every year, not to mention the expense. We waited a few years for Tenacity to be available to the public and have both been having great results with the product. The good thing is that the remaining blades of good turf remain green in the kill zone. That gives me hope that I may not have to reseed, just wait for the good turf grass to fill in by itself. Our lawns are a combination kentucky blue and fescue blends. My only complaint is that the product is so concentrated and thick. The high concentration makes it even more critical to measure accurately! Not too crazy about the enclosed syringe measuring device. I feel it is too difficult to use and the potential to spill is high. I would love if there could be a more diluted Tenacity product to purchase for the average homeowner. That would make the product easier to measure, plus ensure a bit of wiggle room on the measurements?

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  • 27 of 29 people found this review helpful:

    4 of 5 Stars  Appears to be working!!!!!!!!!!!!
    By Del in Decatur, IL on June 17, 2012
    Verified Purchase

    I was skeptical about whether Tenacity could kill the Nimblewill in my lawn and still leave my Blue Grass and Fescue alone. It's been 2 weeks since the first application and it appears to have definitely wounded the Nimblewill. The second application was applied yesterday, so we'll see if it kills it or not. It's a "pricey" chemical, but is easy to use and hopefully effective. If it works it sure beats Roundup and reseeding.

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  • 22 of 22 people found this review helpful:

    5 of 5 Stars  No more Crabgrass!!
    By Rob in Greeley, Colorado on August 23, 2012
    Verified Purchase

    This product really works. It does take time, so be patient. I still have to apply the second application to finish off the Crabgrass!!! It won't take much, the plants are almost dead now after 2 weeks.

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Most Recent Customer Reviews
  • 5 of 5 Stars  Death of Nimblewill grass
    By David in Exton, Pa. on October 2, 2015

    It took a while, but the grass and other weeds are all white/dying. I used three teaspoons of "Dawn Ultra" & one teaspoon of Tenacity to two gallons of water, per a study by Ohio State University.

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  • 5 of 5 Stars  Tenacity - great against crabgrass
    By M in Midlothian on September 26, 2015

    Crabgrass was rampant in my backyard. Sprayed once using a tank sprayer and surfactant as directed and virtually all of the crabgrass is now dead. Great product! Also appears to be working on what I call "wire grass", not sure of the technical name but it's weedy and grows low and wide like a rope or wire.

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  • 5 of 5 Stars  Works as advertised
    By David in Wake Forest, NC on September 16, 2015

    I am so impressed with the product so far that I felt compelled to submit a review. I was skeptical about the low dose rate of this herbicide, but it's viscous content went very far. I used it in my tow-behind sprayer (15gal) with nozzle manifold to treat about 15,000 sqft. It has been about 14 days and my crabgrass-infested yard is very white with some of the crabgrass starting to die off. This has really illuminated the weeds in my yard because they all turn white. Second application to be made in about a week, which will hopefully kill off the crabgrass for good

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  • 4 of 5 Stars  Crabgrass control
    By B. in Troy on September 11, 2015

    The product works very well for crabgrass control, preforming best with two applications followed by a light rain. It takes about two weeks to see the full effect but results are very good when other products have failed even with repeated applications. The crabgrass turns white, then dies out to brown. Very pleased with how far the concentrate goes.

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  • 1 of 1 people found this review helpful:

    5 of 5 Stars  Tenacity WORKS!
    By Tom in Bettendorf, IA on September 9, 2015

    I have an infestation of Nimblewill in my bluegrass besides various other species of grassy weeds and other typical annoying weeds (plantian, clover, wild violet, purslane). The local very popular garden expert suggested Tenacity. ONE little teaspoon of Tenacity plus 3 teaspoons of surfacant in 2 gallons of water in a pump sprayer, in one week ALL my test patches on the existing weeds and grasses show they are definitely dying, but NOT the blue grass! I may not need to do the second application, but even so if I have to, it's well worth it.

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  • 5 of 5 Stars  Good Job!
    By James in Hamilton on August 30, 2015

    I have treated Nimble Will and some broad leaf only once. The areas I treated have turned brown after being white and looks like it did the job! I still have a lot more area to do and hope to get rid of all the undesirables in our lawn. Thank you, Jim

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  • 1 of 1 people found this review helpful:

    4 of 5 Stars  2nd application
    By Steve in Countryside on August 25, 2015

    Upgrade my review to 4 stars as the Tenacity appears to be working and I have applied a 2nd application after 3 weeks. I thought it was outstanding that I was called by Do My Own Pest Control and was offered a partial refund for the product that leaked out and review the other comments in my review. Great Customer Service!

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  • 2 of 2 people found this review helpful:

    5 of 5 Stars  Tenacity Herbicide
    By Peter in Darien, CT on August 24, 2015

    2 applications at 2 weeks apart - CRABGRASS DEAD! I used half bottle for my front lawn - about 100 x 100 feet (along with Turbo surfactant) in a hose sprayer. This stuff is darn good - grass (mix of blue, fescue and rye) all good - just the crabgrass and other weeds. Worked better than Trimec - which did not seem to do much at all. The crabgrass first turned white - and now is starting to die out and getting brown. I will now rake or pull out the crabgrass stubs to make room for new grass seeds in Sep. Very pleased.

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  • 1 of 1 people found this review helpful:

    5 of 5 Stars  Works great on bentgrass
    By Dennis in Owatonna, MN on August 23, 2015

    Just as others have described, the bentgrass begins to turn white in a week to 10 days, then dies off. The surrounding bluegrass is unaffected. This is my first application and I see a few places that were missed so will go over it again. It was mid-August when applied. Previous applications of "round-up" did not result in satisfactory control because the bentgrass always came back up from over the winter. Hopefully the Tenacity takes care of it. It's good that I have enough left to do another application in the spring.

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  • 2 of 2 people found this review helpful:

    5 of 5 Stars  Only Herbicide That Works
    By John in Illinois Quad Cities on August 5, 2015

    After trying numerous products to rid my lawn of creeping bentgrass I discovered Tenacity online and decided to give it a try. Within a few days the very invasive grass turned bright white and eventually started to die. I couldn't be happier. It's a little pricey, but a little goes a long way.

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Most Helpful Q&A's

August 9, 2011 William from Springfield, Il. asked:

QHow much Tenacity do you mix in a one gallon sprayer?

AAccording to the Tenacity product label you will need to mix 1/2 tsp of product + 1 1/2 tsp surfactant with 1 gallon of water for spot treatments

86 of 90 people found this answer helpful.
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June 14, 2013 Gregg from Hastings Ne asked:

QApplication tips for Tenacity
I wish to apply Tenacity with a hand sprayer. Do you have any application tips? Would broadcast application be better than spot spraying? If spot spraying, how much should I apply?


According to the Tenacity product label for smaller applications you will need to mix 0.5 tsp of Tenacity, 1.5 tsp of surfactant to one gallon of water and each gallon of solution needs to cover 1,000 sq ft.

Broadcast treatments would be recommended if you are needing to actually treat the entire lawn for pre-emergence, if you are only needing to treat small areas or use as a post emergent then you can spot treat.

33 of 33 people found this answer helpful.
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October 11, 2011 Mary from Marshfield, Wi asked:

QDo I need to keep the dogs away from the area where I have applied Tenacity?

AYou should keep the dogs off of the area while you are applying Tenacity and until the area has had a chance to dry, about 2-4 hours.

31 of 36 people found this answer helpful.
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March 8, 2012 Scott from Grosse Ile Michigan asked:

QAfter applying Tenacity and surfactant how long do you have to wait to seed or sod?

AAccording to the Tenacity product label "Apply Tenacity at 5-8 fl. oz. per acre in at least 30 gallons of water per acre prior to seeding or post seeding of tolerant turfgrass species listed on this label, except fine fescue. Tenacity may reduce density of fine fescue seedings. Tenacity can be used on grass seed blends that contain less than 20% by weight of hard or fine fescue. Tenacity will control many monocot and dicot weeds that compete with and slow the establishment of the turfgrass stands. Apply at grass seeding or close to seeding for best performance. Avoid spraying on newly germinated turfgrass plants. Wait until the newly germinated turf has been mowed two times or four weeks after emergence (whichever is longer) before making a postemergence application." If you need more specific information on a turfgrass not mentioned on the product label you can reach the manufacturer at 866-796-4368.

20 of 26 people found this answer helpful.
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March 10, 2014 Thomas from Cut Off, La. asked:

QWhat is the shelf life of Tenacity?

AThe shelf life on most liquid herbicides all depends on how they are stored. If the product has been tightly sealed and kept out of sunlight and extreme temperatures, the shelf life is 3-5 years.

17 of 17 people found this answer helpful.
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Most Recent Customer Questions

September 24, 2015 Marty from Meriden Ct. 06450 asked:

QSprayed lawn last night with Tenacity Herbicide to rid it of Bentgrass. When can I start cutting and watering it?


You can water the lawn after the the Tenacity Herbicide has dried. You can mow your established lawn 2 days after Tenacity Herbicide application. 

1 of 1 people found this answer helpful.
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September 15, 2015 Mike from Michigan asked:

QCan I apply fertilizer during the treatment period without harming effectiveness of Tenacity?


There should be no issues applying Tenacity around the same time as a feritlizer as long the label on the fertilizer does not state that it cannot be used with herbicides.

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September 2, 2015 Steve from Conway, South Carolina asked:

QCan I apply "tenacity" and the "non-ionic surfactant" while the morning dew is still on the grass?
I waited until the morning dew had dried off of my lawn before applying the product "tenacity" and the "non-ionic surfactant"...However, I overlooked a small detail. The temperature had exceeded 80 degrees.....I assume closer to 84 -87 degrees......was my application in vain?


Morning dew will not lessen the effects of Tenacity. It some circumstances a more moist soil will make for better root uptake. You are safe to make the Tenacity application in the cooler times of the day when temps are below 85 degrees. If temps rise above 85 degrees after the product has dried it should not reduce effectiveness. 

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August 21, 2015 Paul asked:

QHow soon after Tenacity Herbicide treatment can I overseed?


You can overseed 3-4 months after Tenacity Herbicide application. Be sure to follow the product  label for application. 

1 of 1 people found this answer helpful.
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August 17, 2015 Terry from St Paul, Mn asked:

QWhen do I apply Tenacity Herbicide for bent grass?
I have bent grass that is now brown. Is it dormant? When is "just before dormancy?"


If you are trying to apply Tenacity Herbicide to control bentgrass, per the product label:

"Apply Tenacity at 5 fl. oz. per acre in at least 30 gallons of water per acre at two to three week interval for up to three applications. Apply with a NIS surfactant. Bentgrass control may be more effective in the late summer/early fall just prior to onset of renewed bentgrass growth, than spring/early summer applications."

You can also call our Customer Service staff at 866-581-7378 M-F 9a-5p EST if you have further questions.

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August 14, 2015

QCan Dimension 2EW be mixed with Tenacity?
I'm planning to spray in fall to remove weeds and grassy. So, I'm wondering if Tenacity can mix with Dimension? It would be okay?


The Tenacity product label does state that it can be mixed with pre-emergence products to provide season long control.  Dimension's product label does also state that it can be.  Please refer to both for complete instructions and you may need to perform a compatibility test before treatment.

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August 11, 2015 Dean from Omaha, Ne asked:

Q How long after application of Tenacity Herbicide should I wait to reseed?
I will be using Tenacity to control Nimblewill, and my lawn is perennial rye and fine fescue.


Generally, if you are treating with Tenacity Herbicide and using a tolerant seed, the applications can be done at the same time. If not, we would recommend waiting three months after the application of Tenacity Herbicide to re-seed your lawn. If you have any specific questions, we would recommend giving us a call at 866-581-7378.

1 of 1 people found this answer helpful.
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August 9, 2015 Ken from Martinsville, In asked:

QCan Tenacity Herbicide be stored after mixing with water and surfactant for use at a later date?
I mix Tenacity, a surfactant, and water in one gallon batches to spot treat my lawn using a pump sprayer. I frequently have part of a mixture left over when I finish treating. Can I store it for two weeks and use it for a follow up treatment?


Tenacity that has been mixed with water and a surfactant should be used within 24 hours of mixing and then discarded. If it is in its original container and stored away from extreme temperatures, it will have a three year shelf life unmixed.

3 of 3 people found this answer helpful.
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August 8, 2015 Bob from S.dennis, Ma asked:

QIs raking after Tenacity Herbicide application recommended / required ?


It is not required to rake after Tenacity Herbicide application. However, if you are reseeding or anything of that nature it would be best to rake. 

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August 4, 2015 Danny from Bluffton,sc asked:

QWill Tenacity Herbicide kill crabgrass coming up in my Centipedegrass lawn without harming the grass?


Tenacity Herbicide would be a great option for you to control crabgrass without harming your Centipede lawn.  Tenacity needs to be tank mixed with a non ionic surfactant or the best results and stick to the leaf surface of the weeds, and its advised to use a dye like Turf Mark Blue with it so you can make sure to not overlap if you plan to do a broadcast application on the property. According to the Tenacity product label you will need to mix 1/2 tsp of product + 1 1/2 tsp surfactant with 1 gallon of water for spot treatments. After spraying with Tenacity Herbicide, the foliage of treated weeds cease growth after application, then turn white (loss of chlorophyll), and death may take up to three weeks. A repeat application is required after two to three weeks for improved postemergence weed control. 

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