Tenacity Herbicide
Tenacity Herbicide Tenacity Herbicide

Tenacity Herbicide

SYNGENTA

Tenacity Herbicide

Tenacity Herbicide is a selective pre- and post-emergent weed killer designed to control weeds on turfgrass and lawns. Its active ingredient is Mesotrione, and it can provide year-long control of invasive plants such as chickweed, henbit, crabgrass, and over 46 other weeds.

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Tenacity Herbicide is a systemic pre-emergent and post-emergent weed killer. Its active ingredient is mesotrione 40%, known for its selective contact and residual control of turfgrass weeds.

When used as a pre-emergent, Tenacity is absorbed by weeds as they emerge from the soil. When used as a post-emergent, Tenacity is absorbed by the targeted weed through foliar contact.

Tenacity Herbicide can also provide excellent control of crabgrass and many other weeds in residential yards. This is important because the EPA has banned MSMA, our go-to recommendation for crabgrass control, for homeowners or residential use.

Tools Needed

Tenacity Herbicide can be applied with a pressurized hydraulic sprayer, high-volume handgun spray, handheld pump sprayer, or backpack sprayer.

How to Use

Spraying Tenacity pre-emergent to yard

  • Step 1: Determine how much Tenacity Herbicide to use by measuring the square footage of the treatment area. You must measure the treatment areas' length and width in feet, then multiply them together (length x width = square footage). You will also need to determine the species of turf the weed is on before application, as this will affect the application rate. The typical application rate for large areas is 4 to 8 fluid ounces per 30 gallons of water per acre. For smaller areas and spot treatments, a half teaspoon of Tenacity in 1 gallon of water will treat 1,000 square feet. For example, if your area is 2,000 sq. ft., mix one teaspoon of Tenacity with 2 gallons of water.
  • Step 2: Fill your sprayer with half the amount of water, add a measured amount of Tenacity Herbicide, and then pour in the remaining half. Close the spray tank lid and shake until the product has fully dissolved and thoroughly mixed.
  • Step 3: Once your solution is complete, apply Tenacity Herbicide selectively to the target weed, being sure not to over-apply to the point of runoff. Use a fan-spray nozzle setting for even coverage. Repeat application in 2 to 3 weeks for best results.

Where to Use

Applying Tenacity Herbicide to grass

Tenacity Herbicide is used for weed control in turfgrasses in residential and commercial sites, golf courses (excluding putting greens with a 5-foot buffer), sod farms, athletic fields, parks, cemeteries, airports, and lawns.

When to Use

Use Tenacity during the growing season when unwanted weeds are on the property. Tenacity pre-emergent applications must be done in the fall and early spring. For post-emergent applications, it is best to apply Tenacity herbicide to young, actively growing weeds, and a second application may be required after 2 to 3 weeks.

Safety Information

Tenacity Herbicide is safe to use around children and pets when applied according to the product label instructions. Always wear the proper personal protective equipment (PPE) when mixing and applying this product.

Pets and children should not be present during treatment and remain out of the treated areas until completely dried.

Special Considerations

Bentgrass, Poa annua, Kikuyu grass, zoysiagrass, seashore paspalum, and bermudagrass are sensitive to Tenacity mesotrione herbicide applications. Avoid spraying these turf types unless control can be tolerated. Avoid overspray onto ornamental plants or flower beds and gardens. Roses and daylilies are sensitive plant species.

A surfactant with Tenacity is recommended to improve weed control and provide a better stick to the weeds' leaf surfaces.

AvailabilityOnline
Restricted UseNo
Shipping Restrictions8 Ounce: AK, CA, CT, DE, HI, IN, MI, NY, RI, SC, VT, WA
BrandSYNGENTA
Keith's Pro Tips"Tenacity is a powerful herbicide, so it would be wise to mix the product with a marking dye to help you keep track of where you treated so you don't overtreat your grass and possibly do some damage."
Product DrawbacksCan temporarily whiten or bleach desired turf but white grass tips can be mowed off.
Target PestsTenacity Herbicide is labeled for use on the following weeds: Annual Bluegrass, Barnyardgrass, Buck​horn Plantain, Buttercup, Canada Thistle, Carpetweed, Catsear Dandelion, Common Chickweed, Common Dandelion, Common Lambsquarters, Common Purslane, Curly Dock, Florida Betony, Florida Pusley, Galinsoga, Goosegrass, Ground Ivy, Healall, Henbit, Large Crabgrass, Large Hop Clover, Lawn Burweed, Marestail, Mouseear Chickweed, Nimblewill, Oxalis, Pale Smartweed, Pennsylvania Smartweed, Persian Speedwell, Purslane Speedwell, Redroot Pigweed, Shepherd's Purse, Smooth Pigweed, Southern Crabgrass, Sowthistle, Swinecress, Tufted Lovegrass, Verbena, White Clover, Wild Carrot, Wild Violet, Windmillgrass, Yellow Foxtail, Yellow Nutsedge, ​and Creeping Bentgrass. For more target pests, please refer to the label.
Application EquipmentBackpack Sprayer, Hose End Sprayer, Pump Sprayer
Application MethodsBroadcast Spray, Spot Treatment
Active IngredientMesotrione 40.0%
Product TypeHerbicide
FormulationSuspended Concentrate
Application RateFor pre-emergent and post-emergent applications, apply 4 to 8 ounces of Tenacity per acre in at least 30 gallons of water per acre. For spot treatments, mix 1 teaspoon of Tenacity Herbicide in 1 gallon of water to treat 1,000 square feet.
Shelf LifeTenacity Herbicide has a shelf life of 36 months if stored in a cool, dry environment.
YieldIf used at the maximum rate of application per acre to St. Augustinegrass each 8-ounce container will treat an estimated 2 acres.
Use SitesOutdoors
Time to KillTenacity Herbicide begins killing weeds within minutes after application but can take up to several weeks to get complete control depending on the target weed.
Comparable ProductsMeso 4SC Herbicide
EPA Registration #100-1267
4.7/5
Based on 20 reviews
  • 80%(16)
  • 15%(3)
  • 0%(0)
  • 0%(0)
  • 5%(1)
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Pre + post emergent
Great to use as a pre-emergent. Can be also used as a pre-emergent when seeding. Could be used as a post-emergent if u add a surfactant
Easy to measure syringe included
Both pre and post emergeng
Bleaches the weeds
100%
1/29/24
Daryl Hoffman
Verified Buyer
Follow instructions
Great product. Just follow instructions. Read, reread, and double check instructions, or you can kill your grass.
100%
9/20/22
CJ K.
Verified Buyer
Great product
Tenacity is a great product that kills what other herbicides do not. I had a major bent grass issue that nothing else worked on and Tenacity killed it with 2 applications. Works great on crab & quack grass also.
100%
4/20/22
WeTheNorth
Verified Buyer
A Powerful Product
The product is excellent. I would recommend you add a surfactant (it will help it adhere to the leaves of the weeds), and ordinary food colouring as a dye so you can see where you've sprayed. Mixing this all up is a mess. but you'll be glad you did because over-spraying your lawn will damage your grass.

It has to be dry and windless to apply for best results, and an expectation of a couple of dry days is best. It says you can spray if you have several rain-free hours ahead, but my guess, for people that say it didn't work, is that they had rain or a heavy dew right after they sprayed. Don't spray again for at least 2 weeks - you may not have to spray again until the fall. Wear grease monkey or dish-washing gloves and an N95 mask: this stuff is toxic, and don't let pets or children on it for at least 24 hours (regardless of what they say). Don't let spray get on trees or anywhere near a vegetable garden.

It looks like nothing is happening, then in about 10 days all your weeds will start to turn white, and die. If you spray again too soon you WILL kill your grass. For tough weeds like yellow spurge, black medic, crabgrass you may have to pull out the weed after it dies (some of these have underground rhizomes that won't be affected by the spray). Then I spot-spray these about 2.5 weeks later. Spray as soon as you can in the spring mid to late April in zone 5, then as late in the fall as you can - just before frost. You will have the fewest weeds in your neighbourhood.
20%
4/30/21
Mike Taylor
Verified Buyer
It doesn't work
Don't waste your money. There are other cheaper products for ST Augustine that does work
100%
9/15/20
David Tilton
Verified Buyer
This is my first year using tenacity, I would recommend it mostly just for crabgrass, it did an outstanding job on my crabgrass, it also killed other weeds such as dandelions,clover and thistles in my yard, but because of the cost of tenacity I usually just use it on the crabgrass. There are other cheaper herbicides out there that can kill all the other weeds which helps keep the overall cost down.
100%
7/31/20
Robert Noeding
Verified Buyer
Kills bentgrass and crabgraas dead
Kills everything including pesky grass like bentgrass.
100%
5/27/20
Larry Pasekoff
Verified Buyer
Tenacity
We use on Foxtail. Takes about 10days but it works. Must be used with a surfactant.
80%
5/24/20
Bill S.
Verified Buyer
good stuff had reservations about post emergent crab grass but in one week it started turning white and dieing
100%
5/2/20
Bill Mehew Jr.
Verified Buyer
Excellent product! I’ve used it once and will do a second application in 5 days. The nimblewill is already dying! I had an issue with a leaky bottle on arrival and customer service was excellent resolving the problem. I will use Solutions again and recommend them highly!
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More Information
Restricted Use No
Shipping Restrictions AK, CA, CT, DE, HI, IN, MI, NY, RI, SC, VT, WA
Availability Online
Signal Word CAUTION
Keith's Pro Tip "Tenacity is a powerful herbicide, so it would be wise to mix the product with a marking dye to help you keep track of where you treated so you don't overtreat your grass and possibly do some damage."
Target Pests Multi Annual Bluegrass, Barnyardgrass, Bentgrass, Buckhorn Plantain, Buttercup, Canada Thistle, Carpetweed, Catsear Dandelion, Common Chickweed, Common Dandelion, Common Lambsquarters, Common Purslane, Creeping Bentgrass, Curly Dock, Florida Betony, Florida Pusley, Galinsoga, Goosegrass, Healall, Henbit, Horseweed/Marestail, Large Crabgrass, Large Hop Clover, Lawn Burweed, Mouseear Chickweed, Nimblewill, Oxalis, Pale Smartweed, Pennsylvania Smartweed, Persian Speedwell, Purslane Speedwell, Redroot Pigweed, Shepherdspurse, Smooth Crabgrass, Smooth Pigweed, Southern Crabgrass, Sowthistle, Swinecress, Tufted Lovegrass, Verbena, White Clover, Wild Carrot, Windmillgrass, Yellow Foxtail, Yellow_Nutsedge, Ground Ivy, Wild Violet
Time to Kill Tenacity Herbicide begins killing weeds within minutes after application but can take up to several weeks to get complete control depending on the target weed.
Chemical Type Herbicide
Formulation Suspended Concentrate
Application Methods Broadcast Spray, Spot Treatment
Product Drawbacks Can temporarily whiten or bleach desired turf but white grass tips can be mowed off.
Active Ingredient Mesotrione 40.0%
Application Equipment Backpack Sprayer, Hose End Sprayer, Pump Sprayer
Mix Rate For pre-emergent and post-emergent applications, apply 4 to 8 ounces of Tenacity per acre in at least 30 gallons of water per acre. For spot treatments, mix 1 teaspoon of Tenacity Herbicide in 1 gallon of water to treat 1,000 square feet.
Low Use Rate 0.16 oz./1,000 sq. ft.
High Use Rate 0.36 oz./1,000 sq. ft.
Use Sites Outdoors
Yield If used at the maximum rate of application per acre to St. Augustinegrass each 8-ounce container will treat an estimated 2 acres.
EPA Registration No. 100-1267
Shelf Life Tenacity Herbicide has a shelf life of 36 months if stored in a cool, dry environment.
Comparable Products Meso 4SC Herbicide
Children or pets? No
Property Characteristics None
Questions and Answers
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  1. Q:Is your product in liquid or granular firm
    6/13/24
    A:Tenacity comes as a liquid formulation.

    Amanda

    6/13/24
  2. Q:Can you use this product in conjunction with overseeding
    3/11/24
    A:Tenacity can be used for weed control prior to or during seeding of certain turfgrasses during turf renovations.

    Amanda

    3/12/24
  3. Q:How long before a rain can apply?… forecasted 1.35 inches in next 12hrs but doesn’t start for another 5hrs
    2/27/24
    A:I wouldnt apply it now if you have rain in 5 hrs. If its completely dry it should be fine but it may reduce efficacy and with that much rain you might get some runoff to non target areas.

    Zach

    2/27/24
  4. Q:Does Tenacity work on Wild Onion or Wild Garlic??
    2/20/24
    A:Tenacity Herbicide will not control wild onion or wild garlic. We recommend using Fahrenheit Herbicide, which will control wild onion and wild garlic. https://www.solutionsstores.com/fahrenheit-herbicide

    Amanda

    2/21/24
  5. Q:Can I use a stronger application rate on dormant centipede grass?
    1/29/24
    A:I am very sorry but I do not have extensive experience with centipede grass, so I rather not make a recommendation other than: being dormant makes it unable to absorb the chemical, so you may want to wait until the centipede is starting to show.

    Ferenc Szita

    1/30/24
    Certified Buyer
  6. Q:Can tenacity be used on new lawns or along with grass seed when planting?
    10/7/23
    A:Yes, but you need to know which grass types you are dealing with. The list of precautions and grass types are listed in the directions.

    Alan Moyer

    10/8/23
    Certified Buyer
  7. Q:does Tenacity kill and also prevent spurge in a lawn?
    9/18/23
    A:Tenacity Herbicide will not control spurge. To kill and prevent spurge in your lawn, then check out our DIY guide. https://www.solutionsstores.com/spurge-control

    Amanda Chavez

    9/19/23
    Certified Buyer
  8. Q:Can I use Tenacity as pre emergent for POA?
    7/31/23
    A:It doesn't work very well for that application. My yard was heavily infested with poa and I had to burn it down and renovate .

    Shashank Mittal

    7/31/23
    Certified Buyer
  9. Q:Why is this product so sketchy? Why can't I find mixing directions on the manufacturer's website?
    5/31/23
    A:To mix Tenacity Herbicide, you will need to fill your sprayer with half the amount of water, add measured amount of Tenacity Herbicide, then pour in remaining half of water. Close the spray tank lid and shake until the product has fully dissolved and throughly has been mixed. You may refer to the product label for more specific instructions or contact the manufacturer, SYNGENTA. https://www.syngenta-us.com/contact-us

    Amanda Chavez

    6/1/23
    Certified Buyer
  10. Q:How effective is this for use as a pre-emergent in warm season grasses?
    5/28/23
    A:I live in Tennessee and have a cool season grass. I can tell you it works great. I apply once. THe label says to make two applications. I end up sith some clover and others staff but no dandelions. I highly recommend this product. I have turned two friends on to it and they too swear by it.

    William J Gilger

    5/28/23
    Certified Buyer
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