Tenacity Herbicide


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4.5 Rating: 4.5

54 Reviews | 97 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
  • 1 of 2 people found this review helpful:

    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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  • 1 of 1 people found this review helpful:

    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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  • 1 of 1 people found this review helpful:

    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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  • 1 of 1 people found this review helpful:

    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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  • 2 of 2 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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  • 1 of 1 people found this review helpful:

    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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  • 2 of 2 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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  • 3 of 3 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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  • 3 of 3 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

88 of 92 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

October 27, 2015 John from Great Neck, Ny asked:

QWhat are the application instructions for Tenacity on fine fescue turf?
My lawn is fine fescue, and I overseed every spring and sometimes in fall. The label states not to use Tenacity at the same time as seeding fine fescue. Thus, what would be the best strategy to use Tenacity on my lawn for pre and post-emergent purpose? Should I look for an alternative product?


Per the Tenacity label, you will not exceed 5 fl. oz. of product per acre for fine fescue. This is just the max amount that should be used per year and per acre. The rate that should be used is you will need to mix 0.5 tsp of Tenacity and 1.5 tsp of surfactant to one gallon of water covering 1,000 sq ft. Also, Tenacity should NOT be applied at the time you are putting down new seeds or overseeding. This will likely inhibit their growth. You will want to wait until the lawn has been established before applying this product for pre-emergent control. This is generally after three mowings. There are no restrictions for Tenacity with regards to post-emergent control of weeds.

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October 25, 2015 Joe from Omoha asked:

QCan Tenacity be used without a surfactant?


Tenacity should be applied with a non-ionic surfactant to achieve the best results. Please refer to the product label instructions for details on mixing and application.

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October 25, 2015 Douglas from Winter Haven, Fl asked:

QWhat is the amount of Tenacity per gallon for application on a St. Augustine lawn per 1,000 sq ft?
The label only discusses per acre application. How do you break that down per gallon in a sprayer or per 1000 sq ft application? I am using a 4 gallon backpack sprayer.


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

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October 13, 2015 Serena from Berclair, Tx asked:

QDoes Tenacity work on nut grass?


Tenacity is labeled for postemergent control of nutsedge. However, the product label does state that weed control with postemergence applications require a second application after 2 to 3 weeks. You should also make sure that you apply the Tenacity to young, actively growing weeds with a non-ionic surfactant.

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October 11, 2015 Hugh from Lake Mary, Florida asked:

QIs Tenacity Herbicide safe for Floratam?


Tenacity is labeled for use on St Augustine grown for sod only and would not be recommended on a home lawn. Could you tell us what you are trying to treat for and we can try to recommend a product that you can use?

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September 26, 2015 Mike from Mi asked:

QHow long after treatment of Tenacity is safe for animals to be on the treated area?


Tenacity Herbicide should be applied and completely dried prior to allowing anyone (including animals) to return to the treated surfaces.

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September 25, 2015 Marty from Meriden, Ct asked:

QHow long after apply Tenacity Herbicide can the grass be cut?
Answer to Wayne is 2-3 days. Answer to Nancy is 5-7 days. Big difference! Also after applying tenacity when can the lawn go back to its watering cycle. Both of my questions, cutting and watering either pre or post, strive to allow the best conditions to get the best per application. I must have missed reading these things in your attached literature. Thank you. Lastly when can I continue with fertilizing the lawn after an application?


When using Tenacity Herbicide or other post-emergent herbicides, you should not mow at least 2 days before or 2 days after applying the product. You should avoid spraying on newly germinated turgrass plants, and wait until newly germinated turf has been mowed 2 times or 4 weeks after emergence (whichever is longer) before applying, per the product label. Regarding watering, Tenacity is rainfast within a few hours of application, so I would avoid watering within about 3 hours of post-emergent applications. For pre-emergent applications, you will need to irrigate the area with 0.15 inches of water if there has not been this amount of rainfall within 10 days of application. There are no restrictions on fertilizing schedules. Keep in mind that desirable turf may discolor slightly to white or yellow, but listed tolerable turf should recover well. If you are using a fertilizer that can stress the lawn, then it may be a good idea to separate applications by 1-2 weeks. Please let us know if we may further assist you.

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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. 

3 of 3 people found this answer helpful.
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September 22, 2015 Rick from Berea, Ohio asked:

QShould I aerate prior to applying Tenacity?
I am planning on aerating my lawn.


If you plan on aerating it is best to aerate prior to an application of Tenacity. This is especially important for pre-emergent weed control.

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September 18, 2015 Keith from Glenside, Pa asked:

QCan I spray Tenacity at time of seeding?
When using Tenacity at time of seeding do I first spray the soil then seed or do I seed then treat the area? The exact steps I assume I would take would be: scratch-up the dirt as to loosen so the seed works into the soil, treat the now loosened soil with Tenacity, last step spread the seed. Guessing you don’t want to spray the seed with Tenacity. This should then greatly reduce the weeds in the treated are for about 4 weeks.


Tenacity is an effective herbicide for weed control prior to or during seeding of certain turfgrasses during turf renovation. Please see section on use in New Seedings in the Product Label for complete instructions and limitations for your specific turf type.

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