Tenacity Herbicide

$63.50

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4.5 out of 5 stars Rating: 4.6

122 Reviews | 249 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   93
4 stars   17
3 stars   10
2 stars   1
1 star   1

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Average Customer Rating
4.5 out of 5 stars (122)

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Most Helpful Customer Reviews
  • 123 of 130 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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  • 81 of 84 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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  • 55 of 62 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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  • 48 of 52 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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  • 45 of 47 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  Awesome product
    By Morgan in Hubert nc on 05/25/2018

    Very good product starting killing crabgrass quick

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  • 5 of 5 stars  Tenacity
    By John in hagerstown, maryland on 05/20/2018

    It works! worth every penny. Follow the directions...

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  • 5 of 5 stars  Finally success
    By Gb in Plainview TX on 04/20/2018

    After struggling for a year with weeds in my buffalo grass I found something that works and doesn’t harm my grass. It is not an overnight process but the weeds are slowly turning white. I sprayed and waited a week to spray a second time. Then I sat back and waited. Love this stuff.

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  • 5 of 5 stars  Tenacity Herbicide
    By Jim in Girard,Ohio on 04/02/2018

    I recieved my order very quickly. i was surprised to find this product,and the weeds it controls.It is still cold in Ohio but i'm eager to try Tenacity as I have a big problem with bentgrass. To soon to really rate the product.

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  • 5 of 5 stars  Great product
    By Charles in Nashville, GA on 11/07/2017

    Nutgrass and crabgrass was taking over my yard. As I searched for the right product, I came across Tenacity. It worked excellent. I have centipede and Bermuda grass and it worked fine on both. Even though it specifies not to use on Bermuda, I am planning on redoing my backyard as it is not smooth and I was not very concerned with killing the Bermuda grass. Maybe I was lucky.

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  dollar weed
    By Keith in Conway SC on 11/03/2017

    So far product seems to be performing as described. Dollar weed is turning a yellow color. Follow up application being performed this week.

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  Tenacity Herbicide
    By Tom in Canton, Ohio on 10/25/2017

    Used Tenacity on my Creeping Bentgrass problem. Put down two applications and the Bentgrass appears to have died, turning brown while leaving the good grass alone. Since its nearing the end of the season I will wait until next spring to see if the Bentgrass returns and the good grass fills in the dead, brown areas, reseeding if necessary. If it does return then will definitely apply again to finish the job. This product worked like a charm and I would definitely buy it again.

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  Tenacity
    By Robert in Dayton Ohio on 09/22/2017

    This product exceeded my expectations as both a pre and post emergent it works really well

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  Works great !!!!
    By Joe in Burlington, North Carolina on 09/04/2017

    The best stuff for the money !! Works exactly like is says. Ordering was easy and shipping on time

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  • 3 of 4 people found this review helpful:

    2 of 5 stars  Poor long term results for me
    By Rick in Chico,CA on 08/27/2017

    I've had to change my review from last year due to the fact that all of the Bent grass I thought I killed has recovered. I did 3 sprays last summer/fall. It severely damaged the Bent grass but also bleached the desirable grasses. I'm not sure how others claim that good grasses were not harmed. I had to paint my customers lawns because it was so unsightly. Then I had to reseed. A lot of work only to find that the Bent has come back nearly 100%. It did work better on some other weeds.

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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.

102 of 109 people found this answer helpful.
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05/04/2015 Jim from Fort Morgan, Co

QIn one answer about watering you state it does not need to be watered in because it is mixed with water;
however, in another answer you state it does, indeed need to be watered in asap. could you please clarify which is correct. Thank you.

ATenacity is a systemic preemergence and postemergence herbicide for the selective contact and residual control of weeds in turfgrasses. When applied as a preemergent, weeds absorb Tenacity during emergence from the soil. Dry conditions following application may reduce the preemergence activity. If rainfall (0.15 inches) has not occurred within 10 days after a preemergence application, activate with 0.15 inches of irrigation. When used as a postemergent, susceptible weeds absorb Tenacity through foliar contact and soil absorption. Therefore, you should water in Tenacity when using it as a preemergent herbicide but it does not need to be watered in when using it as a postemergent herbicide.

81 of 84 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. 

80 of 87 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.

70 of 72 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.

61 of 64 people found this answer helpful.
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Most Recent Customer Questions

05/25/2018 Todd from Providence, Ri

QHow do I protect vegetables, flowers, creeping juniper when using Tenacity Herbicide?
Is spray drift a problem? Do I need to cover plants? Does a little spray stress large trees?

A

You should cover plants that you do not wish drift of a Tenacity Herbicide application to contact. It should only be applied to established listed lawns as directed. You should avoid vegetables, flowers, groundcovers (junipers), trees etc. Apply on a non-windy day.

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05/24/2018 Jon from Miller Place

QHow long after using Tenacity Herbicide will I see results?

A

When using Tenacity, 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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05/24/2018 Matt from Greenville, Nc

QHow can I kill crabgrass in Centipedegrass?
I have centipede grass in Eastern NC and a real problem with crabgrass. I've tried atrazine but have had no luck. Trying to stay away from quinclorac as everything I read says not to use in centipede lawns. Is there anything I cant get that will kill it- post emergent. Once we get to dormancy this winter (January) I plan on putting down prodiamine to hopefully combat it from a pre emergent stance.

A

As you probably know, Centipedegrass is a very sensitive species of turf so many products that eliminate the crabgrass and other weeds can also cause damage to your lawn. Tenacity is a great pre- and post-emergent herbicide that will control crabgrass along with many other types of weeds without harming your centipede lawn. Make sure to read the Tenacity label very carefully and mix exactly what is recommended as this is a strong product and mis-using it can cause temporary turf injury. When applying Tenacity it is highly recommended to use a temporary turf colorant like Turf Mark Blue to allow you to see where you are spraying. Overlapping your application of Tenacity can cause temporary whitening of the lawn as well, but the color will return in 3-4 weeks at most. Please let us know if you have any other questions.

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05/23/2018 Darl

QWill Tenacity Herbicide kill wild violets?

A

Yes, Tenacity Herbicide is labeled for wild violets. The rate for 1000 square feet is 1 teaspoon.

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05/23/2018 Trey from Shelley, Id

QWill Tenacity prevent Kentucky Bluegrass from filling in?
I would like to control broadleaf and other grassy weeds in my Kentucky Bluegrass lawn. But I do have some thin or bare spots in the lawn that I'm hoping the Kentucky Bluegrass will take over and fill in. Because of the pre-emergent, will Tenacity also prevent the Kentucky Bluegrass from filling in?

A

Tenacity will help control annual bluegrass (poa annua) from germinating in the Fall, but it will not interfere with new plantings of Kentucky Bluegrass. If you are putting down any new seed, apply Tenacity as close to seeding as possible. If you have new KBG seedlings coming up already, then wait to apply Tenacity until after the new grass is established (2 mowings or four weeks, whichever is longer).

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05/22/2018 John from Pulaski

QCan you mix insecticide with Tenacity?

A

It is not recommended to mix certain insecticides with Tenacity Herbicide.  You should wait to apply organophosphate or carbamate insecticides 7 days after treating with Tenacity Herbicide to avoid potential turf injury. Other active ingredients would be fine to use at the same time.

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05/15/2018 Paula from Massachusetts

QDoes Tenacity control/kill poa trivialis?

A

Tenacity Herbicide is not labeled to treat poa trivialis. Please provide your desired turfgrass for an alternate recommendation. Thank you!

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05/14/2018 Robert from Orlando, Fl

QIs Tenacity Herbicide a good choice crab grass control in Centipede grass?
I live near Orlando, FL and have centipede grass. What is a good product that I can use for general weed control? I have several areas with weeds, but not all over the entire yard. I'd like something I can put in a pump sprayer. I know one of the weeds I have is crabgrass, but not sure what the other ones are.

A

 

Tenacity Herbicide? would be a great option for you to control crabgrass, along with many other common weeds, 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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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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05/08/2018 Joe from Ohio

QDoes Tenacity kill moss?

A

Tenacity Herbicide will not control moss.  For moss in lawns we would recommend using the Lily Miller Moss Out in granules or liquid.

1 of 1 people found this answer helpful.
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05/08/2018 Carol

QHow long will it take to show signs of kill after spraying Tenacity Herbicide on Poa Annua?

A

Tenacity Herbicide is only labeled to suppress Poa Annua as pre-emergent. Tenacity Herbicide DOES NOT have any post emergent control when the poa is actively growing. 

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