tenacity herbicide

Tenacity Herbicide Calculator

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Written By: Mark Marino

a Massachusetts Core Applicator License holder and owner/operator of Lawn Phix,

Updated on

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  1. Select if used as a Pre-Emergent (weed prevention) or as a Post Emergent (weed killer)
  2. Select Low or High rates of Tenacity Herbicide (see below for more details)
  3. Type your total square feet you’re looking to cover

Tenacity Application Rates

Recommended Application Rate for Tenacity Herbicide:

  • Hand-held or Backpack Sprayers: Mix 1 teaspoon of Tenacity per 2 gallons of water. Add 3 teaspoons of a non-ionic surfactant (NIS).

Detailed Mix Rates:

  • Pre-Emergent Application: Mix 1/2 teaspoon of Tenacity with 1 gallon of water to cover 1,000 sq ft. Water in with 1/4″ of irrigation or rainfall within 1-2 days.
  • Post-Emergent Application: Mix 1/2 teaspoon of Tenacity with 1 1/2 teaspoons of NIS in 1 gallon of water to cover 1,000 sq ft.

Maximum Annual Usage:

  • You can apply up to 16 fl. oz. of Tenacity per acre per year, which is about 0.367 ounces per 1,000 sq. ft.

Use Our Tenacity Calculator

Calculate the precise amount of Tenacity needed for your lawn. Choose pre-emergent or post-emergent to get exact mix rates and surfactant amounts.

How much Tenacity is used per 1,000 sq. ft.?

Apply between 5-8 fl. oz. per acre, equating to 0.11 – 0.18 fl. oz. per 1,000 sq. ft. For St. Augustinegrass, use 4 fl. oz. per acre.

How much water is needed for applying Tenacity herbicide?

Use 1 gallon of water for every 1,000 sq. ft. as per the Tenacity herbicide label.

Can Tenacity be applied as both a pre-emergent and post-emergent herbicide?

Yes. For pre-emergent use, omit the NIS and water the product in with 0.25″ of water. For post-emergent use, mix with NIS and avoid watering for at least 4 hours post-application.

Can I mow my lawn before applying Tenacity?

Wait two days before and after applying Tenacity to mow your lawn.

Grass TypeSpeciesRate per Acre
Kentucky Bluegrass (KBG)Poa pratensis5-8 fl. oz. 
CentipedegrassEremochloa ophiuroides5-8 fl. oz. 
BuffalograssBuchloe dactyloides5-8 fl. oz. 
Tall FescueFestuca arundinacea5-8 fl. oz. 
Perennial Ryegrass*Lolium perenne5 fl. oz. 
Fine Fescue (creeping red, chewing, and hard)Festuca spp.5 fl. oz. 
St. Augustinegrass** (grown for sod)Stenotaphrum secundatum4 fl. oz. 
Author's Note: this piece has been updated for accuracy since its first publication on
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Author: Mark Marino
My name is Mark Marino, and I am the founder, owner, and operator of Lawn Phix. With a passion for lawn care and turf nutrition for over a decade, I've dedicated countless hours to correcting soil and perfecting lawns. Today, my expertise, backed by formal courses at UMass Extension Pesticide Education, allows me to offer top-tier lawn care services and advice. I am a fully licensed and insured lawn care applicator in Massachusetts, specializing in comprehensive turf nutrition, weed control, and lawn pest control. My license number is AL-0053865. Contact me at mark@lawnphix.com or +1 (508) 500-8402.

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