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Tenacity Herbicide

Tenacity Herbicide
  • Buy 2 for $69.95 each and save 7%

Availability: In stock

Tenacity herbicide will allow lawns to look well from the beginning. Tenacity can be applied to existing weeds at seeding and provide residual control to continue keeping lawns and turfs looking good. It can be used to remove crabgrass, nimbleweed, bentgrass and other difficult to control weeds. It removes broadleaf weeds such as clover, dandelion, and chickweed. See label for a complete list.

Prop65 California Proposition 65 WARNING



Tenacity Herbicide

Tenacity herbicide will allow lawns to look well from the beginning. Tenacity can be applied to existing weeds at seeding and provide residual control to continue keeping lawns and turfs looking good. It can be used to remove crabgrass, nimbleweed, bentgrass and other difficult to control weeds. It removes broadleaf weeds such as clover, dandelion, and chickweed. See label for a complete list.

Tenacity is a systemic herbicide used in cool season turf and is safe to use in newly seeded and established turf. It has a wide window of application. Two applications are needed for control of listed weeds as a post-emergent treatment.

As a pre-emergent and post emergent herbicide it will control 46 weeds and grass species (see label for a complete list). Tenacity is classified by EPA as a "Reduced Risk" product compared to other herbicides. It is naturally derived from the bottlelbrush plant.

  • Can be applied prior to, at, or after seeding of tolerant turfgrasses.(See label for timing of applications of seedling turf)
  • Removes creeping bentgrass from roughs and approaches as well as bluegrass from roughs.
  • Ideal for renovations

Tenacity's Unique Mode Of Action

The active ingredient, Mesotrione curtails photosynthesis by inhibiting a plant enzyme called HPPD. It also prevents carotenoid formation in susceptible plants. Without this carotenoid formation, chlorophyll and cell membranes are destroyed and the leaves are white or bleached with resulting death of the plant. After the susceptible  plant absorbs, Tenacity Herbicide will work in two to three weeks.

Turfgrass Species

Species Rate Per Acre
Kentucy bluegrass 5-8 oz
Centiepedegrass 5-8 oz
Tall Fescue 5-8 oz
Perennial ryegrass 5 oz
Fine Fescue 5 oz
St Augustinegrass 4 oz

Tenacity -Tank Mixed With Other Herbicides

Tenacity can be tank mixed with Prodiamine 65 WDG (same as Barricade) or Resolute , 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.

Additional Information

Additional Information

Pro Tips Not Available
Packaging 8 oz
Manufacturer Syngenta
Product Label Label(Same as 8 oz)
More PDF's No
Target Pest No
Active Ingredient (s) Mesotrione 40%
For Use :
  • Tenacity can be applied to many of the most common turf types such as Kentucky bluegrass, perennial ryegrass, tall fescue, fine fescue, centipedegrass and buffalograss. Lower use rates are recommended for perennial ryegrass and fine fescue.
  • Tenacity may be used at and before seeding on Kentucky bluegrass, tall fescue, perennial ryegrass, and centipedegrass. Application at seeding can also be made to seed blends of fine fescue if the fine fescue is less than 20% of the seed mixture.
  • Tenacity is not recommended for use on zoysiagrass, hybrid or common bermudagrass, seashore paspalum, or kikuyugrass.
  • Tenacity may be used for weed control in turfgrass species listed on this label in commercial and residential sites. Use sites include non-crop areas: golf courses, sod farms, athletic fields, parks, residential and commercial properties, cemeteries, airports, and lawns. Do not use on golf course putting greens and maintain a five foot buffer between treated areas and putting greens.
Yield Acre 5 to 8 fluid ounces per acre wit 20 gallons of water, Spot treatments: 1 teaspoon + 1 teaspoon of a surfactant in 2 gallons of water per 1,000 sq ft
Mixture|Application See label for use rates
Application See label for use rates1 teaspoons in 2 gallons of water per 1,000 sq ft
Retreatment twice on listed weeds as post-emergent treatment
Shipping Restrictions WA
More Instructions

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.


Customer Reviews 8 item(s)

Great product definitely worth it and will purchase it again in future
This is first time in o lifetime that I have seen crabgrass diehard
Review by Ptours / (Posted on 8/1/2019)
Great service, right price, Excellent packaging, prodict is working as it was intended. Very pleased.
Review by Wolf / (Posted on 5/16/2019)
Great for removing tall fescue from bluegrass
This product is great for us that hate to have tall fescue patches mixed in with our bluegrass. On the internet the only way they say you can remove it is with Roundup. If you apply tenacity at normal strength to the Tall Fescue patches every 4 to 5 days then it will eventually kill the tall fescue and leave the bluegrass untouched. It takes 3 or 4 weeks to do it. You can not wait a week to reapply because the tall fescue can start to recover in that period of time.
Review by johhnytheweedkiller / (Posted on 9/3/2018)
Not a quick fix but did work
After 2 spot applications to control some invasive bent grass mid 2017 did notice some yellow/white strands down in the blue grass. Did not pay much attention later in the season but this year the results are visible. The large areas of bent grass are gone and only some of the fringe areas where I possibly did not get a full 2 applications down show any bent grass. No bare spots as the blue grass filled in nicely. Will do another 2 applications to see if there is any bent lurking in the turf, the yellow/white strands are hard to miss. Would recommend this product to anyone who has patches of bent scattered in their lawn but don't expect immediate results.
Review by James / (Posted on 6/12/2018)
Great product when starting grass seed
Have not found anything else that works as well for pre and post emergent when trying to grow seed. DIY pest control service and shipping A+
Review by rrmccabe / (Posted on 5/14/2018)
Mixed results using Tenacity for Nimblewill control
Started treating my 30000 sq. ft. lawn in New Hampshire with tenacity and a surfactant last year putting down two applications about 2 weeks apart. First application was in late June and second in mid-July. Used concentration of 2 tsp per 4 gallons water. It took 7 full sprayers (28 gallons) to cover the entire yard. Some areas of the lawn were thick with nimblewill while other areas had sparse infestation of the weed. Tenacity started to show some whitening of the weed after about 5 days. I treated the entire yard and was surprised to see that I had nimblewill in areas I had not suspected. Results were mixed after all treatments were complete. Tenacity seemed to do the well in certain areas but definitely not 100% of the lawn. I used a 4 gallon backpack sprayer. Getting even coverage may have been my problem. Would suggest using a colorant which would help with even coverage. By the end of the season some areas of the lawn were bare dirt while other areas still had substantial nimblewill growth. Tenacity seemed to have no negative effect on grass in the lawn which is a northeast mix of blue, fescue and rye. Overseeded in the fall so bare spots began to fill in and by this spring lawn looked pretty good. Now, I am again seeing nimblewill in the heavily infested areas. In fact, some of the areas look worse than they did last year. Started treating the lawn again this year paying special attention to areas of thick nimblewill. Since this is the only product advertised for nimblewill control I am hoping that this years campaign will be more successful. Will come back and give an update.
Review by Liveformylawn / (Posted on 5/12/2017)
Haven't found anything better for post emergence crabgrass killer in st augustine
First time user of Tenacity. Sprayed for post emergence crabgrass in st augustine lawn. Knocked it back pretty good but doesn't show yet an outright kill.(24 days since spraying) Will repeat spray again with a tank mix for post emergence broadleaf weed killer and/or nut grass killer.
Review by John / (Posted on 11/28/2016)
weed killer
I used it on my st augustine lawn with a pumped up sprayer. 1 teaspoon in 2 gal of water. It calls for 2 applications and I appled the first and it is really doing a great job once I hit it a second time it should do the job. I'm very pleased and it is saving me a lawn service that would of charged me $100 per lick.
Review by vic / (Posted on 10/30/2013)

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