Tenacity Herbicide

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4.5 out of 5 stars Rating: 4.6

87 Reviews | 120 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   65
4 stars   14
3 stars   7
2 stars   0
1 star   1

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Average Customer Rating
4.5 out of 5 stars (87)

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Most Helpful Customer Reviews
  • 80 of 86 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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  • 57 of 58 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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  • 38 of 44 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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  • 38 of 40 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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  • 34 of 36 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  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

    I USED TENACITY JUST OVER 2 WEEKS AGO. IT SEEMS TO BE DOING A GOOD JOB. THE GOOD GRASS IS FILLING IN. I'VE TRIED 3 OR 4 OTHER METHODS OVER THE YEARS. NONE WORKED. SEVERAL OF YARDS AROUND ME HAVE ALSO TRIED TENACITY. ALL SEEM TO BE DOING THE JOB.

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  Tenancity Herbicide
    By Tim in Hanover, Illinois on 09/28/2016

    Lawn has very heavy weed pressure from years of neglect. Especially the grassy weed, nimblewill...Nothing will touch it until I found Tenacity Herbicide. Purchased same from Do My Own Pest Control. Product came via normal mail within 5-7 days. Mixed product in a hand held 1.5 gallon sprayer with regular liquid detergent used as a surfactant. 1 oz. of detergent and 1 teaspon of Herbicide per gallon of water was used. Product was put on 23 days ago and you can clearly see the nimblewill is nearly dead. I have an area that is almost solid nimblewill and it has killed this area as well. The nozzle on the sprayer sprays very fine, almost like a mist and i believe that helped as well keeping the product on the target. One issue only, if you have a lot of patches like i did, you will have some explaining to onlookers as you definitely have light patches where applied. Green is coming into these areas daily but is still visible at day 23....works as advertised. I used a plastic picnic teaspoon to measure product, not syringe provided as I am used to this method... clean up was easy with water.

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  • 5 of 5 stars  tenacity
    By Faw in moravian falls n.c. on 09/28/2016

    i am so pleased to find a product that will kill nimbleweed and wild violets. i have recommended this to my friends.

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  • 5 of 5 stars  Bent Grass and Others Lawn Weed Killer
    By Dan in Elm Grove on 09/27/2016

    Excellent product

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  • 5 of 5 stars  Nimblewill Killer
    By Roger in LaPorte IN on 09/17/2016

    Don't let nimblewill take over! In home turf it spreads in outgrowing circles and the effect is not good. Purdue Ag Agent advised dead kill or pick it out by hand - right! Tenacity has solved our problem. It took most of two seasons as I was very cautious not to over use. Advice about spraying a second time is excellent as you will miss some. Reaction time is longer than most and using a spreader is wise. Watch closely for regrowth and be careful handling. I'm a chem major; this is a great product but deserves care and respect.

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  • 5 of 5 stars  Tenacity herbicide
    By Albert in homeworth oh on 09/17/2016

    This stuff really knocks out crabgrass. Works on other weeds too.

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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.

62 of 67 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.

37 of 38 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?

A

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

36 of 40 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 48 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?

A

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.

31 of 32 people found this answer helpful.
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Most Recent Customer Questions

10/06/2016 Doug from Oxford

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

A

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.†

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09/29/2016 Greg from Sarasota, Fl

QWill Tenacity Herbicide control bahiagrass?

A

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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06/16/2016 Dale from Crete, Ne

QIf it is 70 degrees in the morning and will get up to 95 in the afternoon, can I still apply Tenacity Herbicide?
I noticed a question about temperature and application of Tenacity, you stated it can be applied up to 80 degrees. Is that during application?

A

When mentioning†Tenacity Herbicide†and temperature, we are referring to the temperature at time of application. If it gets above 70 degrees after your application has dried, that is okay.†

8 of 8 people found this answer helpful.
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06/07/2016 Tommy from Richmond, Va

QWhat do I do if it rains on recently applied Tenacity Herbicide?
I applied Tenacity to my yard in Richmond, VA. Shortly afterwards, a quick thunderstorm and shower hit the area. Do I reapply immediately assuming it did not dry properly, or do I wait the 2-3 weeks and apply again? Also, I have a nutsedge infestation. I got Tenacity for that specific purpose. Sedgehammer was mentioned as a better solution, but I was also told to that I would not be able to aerate and overseed in the fall if I used it. Is this true? Thanks.

A

If it rained less than 4 hours after applying Tenacity Herbicide, you will need to reapply, but wait until the area has dried. Tenacity Herbicide is labeled for Yellow Nutsedge so it should work if that's what you have, just make sure to follow the label instructions. Sedgehammer Herbicide is definitely a great solution for nutsedge. According to the label you may overseed with annual or perennial ryegrass or bermudagrass, 2 weeks after application. All other seeding can be done 4 weeks after application. If you plan to aerate, you can do it 3-4 weeks after application as well to avoid stressing your grass.

2 of 2 people found this answer helpful.
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05/15/2016 Dan from Randolph, Mn

QDoes Tenacity work on quack grass?

A

Tenacity is not labeled for quackgrass elimination. We do carry a similar product called Certainty that is a selective, post-emergent that is labeled to eradicate quackgrass. Please refer to the product label for full mixing and application for the best results.

3 of 3 people found this answer helpful.
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05/05/2016 Julie

QDoes a long storage time reduce the efficiency of Tenacity?
Tenacity worked wonderfully on my lawn when I first got it but I have stored it for approx. 3 years and the stored product does not seem to be working at all to kill weeds. I stirred it thoroughly before adding to water in sprayer. I used the recommended 1/2 tsp. per gal. of water.

A

Tenacity Herbicide†if stored in a cool dry area will last up to 3 years. It sounds like you need to purchase fresh product. The mix rate you are using is correct.

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05/03/2016 John from Clifton Park, Ny

QIs Tenacity Herbicide organic?

A

No, Tenacity Herbicide†is not organic.

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05/03/2016 Tom from Potomac, Md

QWill Tenacity kill nimblewill?

A

Yes, you can use Tenacity to kill nimblewill. 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.

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05/03/2016 Gerald from Albany, Oregon

QHow many times in a calendar year can I use Tenacity?

A

You would not apply†Tenacity Herbicide†at a rate of more than 16 oz per acre per year or per crop (equivalent to a maximum of 0.50 lb. of mesotrione per acre per year), whichever is shorter.

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04/29/2016 Bob from Fairborn, Oh

QWhen can I apply Weed and Feed after using Tenacity Herbicide?
applied 4/1/16 and 4/18 /16

A

We would recommend waiting at least four weeks to†apply†a Weed and Feed after using Tenacity Herbicide.†

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