Tenacity Herbicide


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4.5 out of 5 stars Rating: 4.6

92 Reviews | 156 Q&A


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Tenacity Herbicide bottle (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.

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   68
4 stars   16
3 stars   7
2 stars   0
1 star   1

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Average Customer Rating
4.5 out of 5 stars (92)

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Most Helpful Customer Reviews
  • 88 of 94 people found this review helpful:

    5 of 5 stars  Tenacity Herbicide
    By Frank in Johnston, IA on 05/07/2012
    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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  • 58 of 59 people found this review helpful:

    5 of 5 stars  A Miracle Herbicide!
    By Margaret in Scarsdale, NY on 08/14/2012
    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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  • 40 of 46 people found this review helpful:

    5 of 5 stars  Great product! Does exactly what it advertises!
    By Debi in Toledo, Ohio on 09/07/2012

    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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  • 39 of 41 people found this review helpful:

    5 of 5 stars  No more Crabgrass!!
    By Rob in Greeley, Colorado on 08/23/2012
    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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  • 35 of 37 people found this review helpful:

    4 of 5 stars  Appears to be working!!!!!!!!!!!!
    By Del in Decatur, IL on 06/17/2012
    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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Most Recent Customer Reviews
  • 5 of 5 stars  Dying weeds a beautiful sight.
    By Angelo in PLAINFIELD,IL on 04/19/2017

    Laid down product on 1000 sqft on a Saturday, 7-10 days later I have existing weeds turning yellow and white. Weeds that are just breaking the surface are almost immediately turning yellow and white as well. Currently I have a bunch of white dying pre and post weeds on my lawn. Product works great so far, just need to have patience and it will surprise you.

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  • 4 of 5 stars  Seems to be working
    By Eric in STEWARTSTOWN, PA on 04/14/2017

    I applied Tenacity last week and the weeds are whitening up. Still waiting to see if they die all the way. I did an application on part of my lawn too early in spring when the temps were still getting into the 30's at night and I don't think that application worked. Still another week or two to go to see if the weeds completely die.

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  • 5 of 5 stars  i love this stuff
    By Chris in Camby, Indiana on 04/05/2017

    This is the best herbicide I have ever used.

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  • 2 of 2 people found this review helpful:

    5 of 5 stars  Worked Really Well On St.Augustine Floratam
    By J_l_ in Tampa, FL on 03/07/2017

    Extremely satisfied with the product. Took 2 applications in 2 weeks, with the 2nd application at a slightly stronger strength. First spray didn't seem to do anything but after the second spray close to 90% of the weeds were gone. In total, about 4 weeks for the product to work. Some blades turned white so lawn looks like it has highlights but grass is still healthy and should grow out of it. It may take multiple applications so don't be discouraged if it doesn't seem to work at first.

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  • 4 of 5 stars  Florida St. Augustine grass
    By Charlene in Ft. Myers FL on 01/23/2017

    Seems to be more effective than others but we haven't won the battle yet. Make sure you add the spreader so you dont waste time and money.

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  • 5 of 5 stars  Bentgrass invaded 1.5 acres
    By Nancy in Cuyahoga Falls, Ohio on 11/19/2016

    Amazing product. Wish had known after new seeding of 5000 sq ft in summer after pool install. Summer grass planting - Big mistake - was overrun with barnyard grass - good thing I love to weed = 6 hours a day for days and days. I knew I had bent grass, too - was invaded by neighbors - 'course easy to blame them (smile). Now am conquering bent grass and spray 2 feet into neighbor's yards on either side as a buffer. Lovin' the results. Happy to pay the price. thanks so much. Ohio

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  crabgrass killer
    By Dark in saint johns on 11/07/2016

    Goes a long way. One teaspoon for each gallon. Applied and the crabgrass began dying out in about 8 to 10 days. None of my St Augustine Floratamwas affected in any way. This product does the job. I would strongly recommend this product to anyone wanting to get rid of crabgrass.

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  Tenacity
    By Bill in west Islip on 10/10/2016

    Works as described. Got worried cause thought it wasn't working(looking for instant results) within 2 weeks weeds were white and dead. Would highly recommend. A little bit goes a long way. Will last forever

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  • 5 of 5 stars  @ the time best price on the Web; less expensive than E_ay
    By Donald in West Springfield, MA on 10/06/2016
    Verified Purchase

    "LOVE" this product, prior to it being available to consumers. Getting bentgrass out of my Kentucky Bluegrass lawn was a nightmare. Had to kill the bentgrass, dig up huge brown bentgrass spots, put down sod. One year I put down 45 rolls of sod. Only to have the bentgrass return to the spots I missed. Each Fall I spray entire lawn X2, this herbicide targets certain weeds, the rest of grass is left alone. I just have spots of white (weeds dying). Spray entire lawn in the Spring, just too make sure I got them all. No more problems with bentgrass!

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  • 5 of 5 stars  YEARS OF SPOTS BAD GRASS
    By Ron in SHAKOPEE, MN. on 09/30/2016


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Most Helpful Q&A's

10/11/2011 Mary from Marshfield, Wi

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.

69 of 74 people found this answer helpful.
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04/21/2015 Wayne

QHow soon can I mow my lawn after an application of Tenacity?


You can mow your lawn 2 days before application of†Tenacity Herbicide and 2-3 days after application.†

43 of 48 people found this answer helpful.
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03/10/2014 Thomas from Cut Off, La.

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.

42 of 43 people found this answer helpful.
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07/20/2015 Lori from Keokuk, Ia

QAfter spraying Tenacity Herbicide, when the weeds turn white, do you pull them or just reseed?
I was told I had nimblewill in my yard. It was a large portion with green blades and brown plus some other weeds. I purchased tenacity from you and applied it. The areas that were brown and green haven't turned white but the are scattered portions of other weeds that have. Does that mean anything? Also, am I supposed to pull them after they turn white and reseed?


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. We would not recommend pulling up any weeds because the product will not get into the root system, and the weeds may come back at that point.

38 of 39 people found this answer helpful.
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03/08/2012 Scott from Grosse Ile Michigan

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.

34 of 51 people found this answer helpful.
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Most Recent Customer Questions

10/19/2016 Al from Waterford, Michigan

QHow soon can I reseed after applying Tenacity Herbicide to kill bentgrass?
I applied 3 applications in two-week intervals. The lawn was 80% bentgrass. Is it getting too late in fall to seed?


Per the product label on Tenacity Herbicide, apply at grass seeding or close to seeding for best preformance. If you are not close, meaning within a week of application, then you would need to wait 6-8 weeks to re-seed, As for your questions is it too late ot re-seed, we recommend you contact a master gardener in your area or your Local Extention Office to get more information on that.†

2 of 2 people found this answer helpful.
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10/06/2016 Doug from Oxford

QCan I still apply Tenacity Herbicide to my lawn in Ohio in October?


Tenacity Herbicide can be applied any time the weeds and grasses you are treating are still actively growing with temperatures†consistently above 55 degrees. Please let us know if we can be of any more assitance.†

3 of 3 people found this answer helpful.
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09/29/2016 Sylvia from Nashville, Tn

QHow long after Tenacity application can I seed with an annual rye?
I see instruction for perennial rye but not annual. I have decided to switch to Bermuda next year so a temporary rye lawn would be best for me this winter but I've already treated with Tenacity twice. How long until I can seed annual Rye? Or not at all?


When using Tenacity Herbicide there should be no issue with planting annual rye seed after using it. Per the product label you would want to apply either at seeding or close to it for the best performance.†

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09/29/2016 Greg from Sarasota, Fl

QWill Tenacity Herbicide control bahiagrass?


Tenacity Herbicide is not labeled for bahiagrass. However, you could use a product like ProSedge Herbicide. It is labeled for bahiagrass and is safe for use on various types of lawns, including St. Augustine, as long as it is not Floratam.†

0 of 1 people found this answer helpful.
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09/27/2016 Bill from Palm Coast, Fl

QWhat is best herbicide to control weed called nimblewill in mixed lawn of Zoysia & St. Augustine Grass, FL?
We are in mid Florida on East Coast above Daytona Beach and below St Augustine in a city called Palm Coast, Fl.


Tenacity Herbicide is a great option for post emergent control of nimblewill. It is also safe for use in St. Augustine and Zoysia grass. You will need to mix 1 tsp of product + 3 tsp surfactant with 2 gallons of water for spot treatments.

1 of 1 people found this answer helpful.
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09/27/2016 Joshua from Canton, Oh

QCan aerate after using Tenacity Herbicide?
I'm trying to build a schedule but I have a hard time planning it out. I plan to core aerate my yard now and then after winter and again in the fall and overseed. Does it matter when I aerate after applying this stuff or do I need to wait until all the weed grasses are gone? I assume that the weeds being covered by this will still die even if they end up buried under the cores.


SInce you can use Tenacity Herbicide either prior to or during seeding of certain turfgrasses you could either aerate before or after using the product and it would still work. There is nothing on the product label stating that there is a certain time to do aerating.†

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09/20/2016 Tom from Sidney, Ne

QIs Tenacity effective on Windmill grass?


Tenacity Herbicide†is labeled to treat for Windmill grass.†

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09/16/2016 Bob from Warrenton, Va

QHow long after applying Tenacity before I can apply fertilizer?


We recommend waiting 2-4 weeks between applications of herbicides and fertilizers to avoid over stressing the treated areas.

2 of 2 people found this answer helpful.
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09/15/2016 Rodolfo from Yakima, Wa

QHow do I apply Tenacity only to a couple of small Patches of bent grass on my lawn?
How do I apply a small amount. What is the mixture ratio of water and tenacity to cover this small area - both patches are maybe 8 feet square?


According to the Tenacity product label you will need to mix 1 tsp of product + 3 tsp surfactant with 2 gallons of water for spot treatments applied at a rate of 1 gallon per 1,000 sq ft. If you can acurrately measure a smaller amount it could be halved to do 500 sq ft but anything smaller would not be recommended.†

3 of 3 people found this answer helpful.
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09/14/2016 David from Statesville, Nc

QDo you need to add a surfactant for Tenacity Herbicide pre-emergent application?


No, when using Tenacity Herbicide as a pre-emergent a surfactant is not needed. Only when you are using it as a post-emergent.

3 of 3 people found this answer helpful.
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