Tenacity Herbicide Frequently Asked Questions (The Ultimate FAQ Guide)

Tenacity herbicide

I see so many questions about Tenacity herbicide. It’s an awesome and unique chemical to include in your lawn care program – but there are many questions that pop up. Most of which can be answered by reading the label. So, I’ve come up with this laundry list of frequently asked questions (FAQs).

Feast your eyes on the complete, ultimate guide to all things Tenacity herbicide. These are the most common questions that I have found across the interwebs. Enjoy!

Can I Spray Tenacity On Wet Grass?

For best results, apply Tenacity to a dry lawn. This will allow the herbicide and surfactant to better adhere to the weeds.

Can Tenacity Be Applied Before Rain?

You can apply Tenacity herbicide as a pre-emergent before the rain. However, when used as a post-emergent weed killer, it’s best to apply it 4 hours before rainfall.

Can Tenacity Be Applied In The Fall?

Yes, Tenacity can be applied in the fall to target labeled grassy and broadleaf weeds.

Can Tenacity Be Mixed With 2,4-d?

Yes, Tenacity herbicide can be mixed with 2,4-d.

Can Tenacity Be Used On New Grass?

Yes, Tenacity can be used on new grass. However, the new grass either needs to have been mowed at least twice, has been 30+ days since germination, or whichever is longer.

Can Tenacity Be Used When Overseeding?

Yes, Tenacity (mesotrione) is a selective herbicide that will not affect the germination of your good grass seeds (Kentucky Bluegrass, Centipedegrass, Buffalograss, Tall Fescue, Perennial Ryegrass, Fine Fescue, St. Augustine Grass (grown for sod only))

Can You Mix SpeedZone With Tenacity?

Yes, mixing Tenacity with Speedzone makes a powerful selective herbicide that will work on a long list of grassy weeds and broadleaf weeds

Can You Spray Your Entire Lawn With Tenacity?

Yes, you can blanket spray Tenacity herbicide on your lawn as long as your grass is listed on the label. However, blanket spraying over your entire lawn can temporarily bleach your good turf.

Can You Use Tenacity After Overseeding?

You can use Tenacity herbicide during overseeding. However, you cannot spray Tenacity herbicide on new grass that has germinated before 30 days. It’s best to wait until the new grass has germinated for +30 or has been mowed at least twice.

Can You Use Tenacity As A Pre Emergent?

Yes, you can use Tenacity as a pre-emergent during overseeding. When used according to the label, you should see 3-4 weeks of pre-emergent efficacy.

Tenacity herbicide
Tenacity Herbicide

Can You Use Tenacity Herbicide On Bermuda Grass?

Bermudagrass is sensitive to Tenacity (mesotrione). Apply 5 oz. per acre (43,560 sq. ft.) on dormant Bermudagrass only.

Can You Use Tenacity In The Fall?

Yes, you can apply Tenacity in the fall. However, to tackle winter weeds, a broadleaf weed killer may be a better choice.

Can You Use Tenacity In The Winter?

For best results, apply Tenacity and other herbicides when weeds are actively growing. Thus, applying this herbicide in the cold winter months is not recommended.

Can You Use Tenacity On Bahia Grass?

No, Tenacity is not labeled for use on Bahia grass.

Can You Use Tenacity On Centipede Grass?

Yes, Tenacity is labeled for use on Centipede grass (5 oz. per acre).

Can You Use Tenacity On Fine Fescue?

Yes, Tenacity is labeled for use on Fine Fescue grass (5-8 oz. per acre).

Can You Use Tenacity On Kentucky Bluegrass (KBG)?

Yes, Tenacity is labeled for use on Kentucky Bluegrass (5 oz. per acre).

Can You Use Tenacity On Tall Fescue (TTTF)?

Yes, Tenacity is labeled for use on Turf Type Tall Fescue grass (5-8 oz. per acre).

Can You Use Tenacity With Surfactant?

When used as a post-emergent weed killer, use 3 teaspoons of non-ionic surfactant (NIS) with 1 teaspoon of Tenacity per 2 gallons of water.

Can You Water After Using Tenacity?

When used as a weed killer, it is best to wait 4 hours after application for optimum results.

Do I Need To Water In Tenacity?

When using Tenacity as a pre-emergent (weed preventer), you will need to water the herbicide in. When used as a post-emergent weed killer, wait at least 4 hours.

Does Tenacity Kill Bermuda Grass?

Tenacity herbicide can damage Bermuda Grass. It is considered “sensitive” to mesotrione and should only be applied when Bermuda Grass is dormant.

Does Tenacity Kill Broadleaf Weeds?

Yes, Tenacity is labeled to kill some broadleaf weeds. Refer to the label for the entire list.

Does Tenacity Kill Creeping Charlie?

Yes, Tenacity is labeled to control Creeping Charlie (ground ivy). To fully eradicate Creeping Charlie, it may take up to two applications.

Does Tenacity Kill Grass?

Tenacity will kill many grassy weeds and may damage or kill grass that is not labeled. Otherwise, it is a selective herbicide and safe for many desirable lawn types of grass – Kentucky Bluegrass, Centipedegrass, Buffalograss, TallFescue, Perennial Ryegrass, Fine Fescue, St. Augustine Grass (grown for sod only)

Does Tenacity Kill Ground Ivy?

Yes, Tenacity will kill and control Ground Ivy (Creeping Charlie).

Does Tenacity Kill Pachysandra?

Tenacity is not labeled for pachysandra control.

Does Tenacity Kill Wild Strawberry?

Tenacity is not labeled for wild strawberry control.

How Long Does Tenacity Herbicide Last?

As a pre-emergent, Tenacity herbicide should last 3-4 weeds as a weed preventer.

Tenacity herbicide
Tenacity Herbicide

How Long To See Results From Tenacity?

Visible results of Tenacity can be seen in as little as 5 days. However, depending on the weeds, severity, and overall conditions can take 10-14 days results.

How Many Ounces Of Tenacity Per Gallon?

Tenacity comes with a syringe. You need 1/2 teaspoon of Tenacity per gallon of water (0.167 oz.). If using as a post-emergent weed killer, also use 1.5 teaspoons of NIS.

How Many Weeds Does Tenacity Kill?

Tenacity is labeled to control and kill over 40 weeds.

How Much Area Does Tenacity Cover?

Tenacity applications use 1/2 teaspoon per gallon, which is generally used for 1,000 sq. ft. of turfgrass. Use our Tenacity Calculator to ensure accurate measurements.

How Much Does 8 oz. of Tenacity Make?

Depending on the grass type, an 8 oz. bottle of Tenacity can cover 1.0 – 1.6 acres of turf (43,560 sq. ft. – 70,000 sq. ft.)

How Much Does Tenacity Cost?

An 8 oz. bottle of Tenacity will cost between $60-$70 depending on the online store. More if you buy the kit which also includes NIS and blue dye.

How Much Dye Do You Use With Tenacity?

The amount of dye depends on how much depth of color you want. But generally, it’s about 0.5 oz. of blue dye per gallon.

How Much Surfactant To Use With Tenacity?

According to the label, per gallon of water, mix 1/2 teaspoon of Tenacity with 1 1/2 teaspoons of NIS. However, it’s OK to use more NIS.

How Much Tenacity Per 1,000 sq. ft.?

For pre- or post-emergent use, use 1/2 teaspoon of Tenacity per gallon per 1,000 sq. ft.

How Much Tenacity Per Acre?

Depending on the grass type labeled for Tenacity, 5-8 oz. of Tenacity will cover an acre of turf.

How Much Tenacity To Use Per Gallon?

Use 1/2 teaspoon of Tenacity per gallon of water.

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Tenacity Calculator

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Tenacity herbicide label

Is Tenacity A Pre Emergent?

Tenacity is a popular pre-emergent herbicide when seeding and provides approximately 3-4 weeks of efficacy. However, when not seeding, it’s better to use other weed preventers like Prodiamine or Dimension.

Should I Use A Surfactant With Tenacity?

For best results, use a non-ionic surfactant with applying Tenacity as a post-emergent weed killer.

What Chemicals Are In Tenacity?

The active ingredient (AI) in Tenacity is Mesotrione (40%).

What Kind Of Weeds Does Tenacity Kill?

Tenacity is labeled to kill and control over 40 weeds, including clover, wild violet, creeping charlie, henbit, chickweed, crabgrass, and dandelion.

Will Tenacity Kill Bentgrass?

Yes, Tenacity will kill and control creeping bentgrass. For best results, use two applications of Tenacity with NIS 10-14 days apart to kill creeping bentgrass.

Will Tenacity Kill Crabgrass?

Yes, Tenacity is labeled to control and kill crabgrass. Tenacity will do a sufficient job at killing younger crabgrass (under 4 tiller stages).

Will Tenacity Kill Nutsedge?

No, Tenacity is not labeled to control or kill nutsedge (nutgrass).

Will Tenacity Kill Poa Annua?

Tenacity is not labeled to kill or control Poa Annua. However, applications can do severe damage Poa Annua.

Will Tenacity Kill St. Augustine Grass?

The fine print on the Tenacity label states that Tenacity can be used on St. Augustine grass when grown from sod. The applications should not exceed 4 oz. per acre on St. Augustine sod.

Will Tenacity Kill Tall Fescue?

Tenacity is labeled safe for use on Tall Fescue. When used according to the label, Tenacity should not damage fescue grass.

Will Tenacity Kill Wild Violets?

Yes, Tenacity is labeled to control wild violets. Since wild violets are hearty broadleaf weeds, they may take two full applications to fully eradicate. For quicker results, mix with Speedzone or Tzone.

Will Tenacity Kill Zoysia Grass?

Zoysiagrass is considered “sensitive” to Tenacity and is not labeled for use on Zoysia.

Is Tenacity Safe For Humans?

Tenacity is harmful if absorbed through the skin. Be sure to wear Personal Protective Equipment (PPE), wash hands/skin that has been exposed to the herbicide, and do not inhale. Wait until the herbicide has completely dried before entering the area – including dogs and pets. For full cautions and risks, please read the precautionary statements on the label.

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