Certainty Herbicide (Selective Warm-Season Turf Herbicide)

Certainty Herbicide (Selective Warm-Season Turf Herbicide)

  • Certainty herbicide weed killer
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Certainty Herbicide (Selective Warm-Season Turf Herbicide)

Certainty Herbicide (Selective Warm-Season Turf Herbicide)

Professional-grade control of nutsedge, Poa annua, and invasive cool-season grasses in warm-season lawns.
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Certainty® is a selective, post-emergent herbicide designed specifically for use in established warm-season turf. It targets some of the most difficult-to-control weeds — including nutsedge and unwanted cool-season grasses — without harming desirable warm-season turf when applied properly.

Ideal for homeowners and professionals managing Bermuda, Zoysia, St. Augustine, and other warm-season lawns.

Approved Turf Types

  • Bermudagrass
  • Zoysiagrass
  • St. Augustinegrass
  • Bahiagrass
  • Centipedegrass
  • Buffalograss
  • Seashore Paspalum
  • Kikuyugrass

Do not apply to cool-season lawns such as Tall Fescue or Kentucky Bluegrass.

What Certainty Controls

  • Purple and Yellow Nutsedge
  • Kyllinga species
  • Globe and Annual Sedge
  • Annual Bluegrass (Poa annua)
  • Unwanted Tall Fescue
  • Perennial Ryegrass (transition removal)
  • Virginia Buttonweed (suppression)

Certainty is especially valuable for removing cool-season grasses from warm-season turf during spring transition.

When to Apply

  • Apply to actively growing weeds
  • Avoid mowing 2 days before or after treatment
  • Apply during warm, growing conditions for best uptake
  • Use a non-ionic surfactant for optimal performance

Application Rates (Per 1,000 sq ft)

Standard Rate: 0.028 oz per 1,000 sq ft

  • Repeat in 3–4 weeks if needed
  • Higher rate of 0.045 oz per 1,000 sq ft for dense infestations

Important: Always measure carefully. Certainty is highly concentrated and applied at very low use rates.

Why Choose Certainty?

  • Highly selective for warm-season turf
  • Excellent nutsedge control
  • Effective Poa annua management
  • Removes unwanted ryegrass and fescue during transition
  • Professional-level results with small application amounts

Certainty® is the go-to solution for precision weed control in warm-season lawns — especially when managing sedges and cool-season grass contamination.

Always read and follow the product label. Use only on labeled turf species.

Details

Active Ingredient Sulfosulfuron - 75%
Lawn Types Bermuda, Zoysia, St. augustine, Centipede
Special Features Great to clean up warm season lawns
Application Rate The bottle includes two measuring scoops: a small scoop (0.16 grams) and a large scoop (0.8 grams) Mix 3 to 5 small scoops or 1 to 2 large scoops per gallon of water for every 1,000 sq. ft. Use a surfactant to enhance effectiveness.
Time to Apply Spring, Summer, Fall, Winter
Target Pests (See product label for complete list) Barley, little Bedstraw, catchweed Bluegrass; annual, bulbous, roughstalk Burweed, lawn Buttercup Buttonweed* Chamber bitter Chickweed, common Clover, white Crowfootgrass Dallisgrass* Dandelion Dichondra, Carolina Fescue, tall Garlic, wild Geranium, Carolina* Henbit* Ivy, ground* Johnsongrass Kyllinga; false green, fragrant, green Lovegrass Mustard, wild Nutsedge; purple, yellow Pennycress, field Pennywort, lawn (dollarweed)* Quackgrass* Ryegrass, perennial Sedges; annual, globe Shepherd’s-purse Switchgrass Violet, wild* Woodsorrell, yellow* * suppression or partial control only
Delivery System Dispersible Granules
Brand Nufarm
For Use In Turf Grass

Frequently Asked

What is Certainty Herbicide used for?

Certainty Herbicide is a selective, post-emergent herbicide designed to control tough weeds, including nutsedge, Poa annua, kyllinga, and fescue, without harming warm-season turfgrass.

Which types of grass can Certainty Herbicide be used on?

Certainty is safe for use on warm-season grasses such as Bermudagrass, Zoysiagrass, St. Augustinegrass, Centipedegrass, Buffalograss, Bahiagrass, Kikuyugrass, and Seashore paspalum.

What weeds does Certainty Herbicide control?

Certainty effectively controls purple and yellow nutsedge, annual bluegrass (Poa annua), perennial ryegrass, tall fescue, Virginia buttonweed (suppression), globe sedge, and kyllinga species.

How much Certainty Herbicide should I mix per gallon of water?

For best results, mix **3 to 5 small scoops (0.16g each) or 1 to 2 large scoops (0.8g each)** per gallon of water per 1,000 sq. ft.

Should I use a surfactant with Certainty Herbicide?

Yes, using a **nonionic surfactant** helps improve absorption and enhances the effectiveness of the herbicide.

When is the best time to apply Certainty Herbicide?

Apply Certainty when target weeds are actively growing. Avoid mowing the area **two days before and after application** to allow for maximum absorption.

How long does it take for Certainty Herbicide to work?

Weed control results can be seen within **7 to 14 days** after application. Some tougher weeds may require a follow-up treatment.

Can I apply Certainty Herbicide in cool-season lawns?

No, Certainty is designed for warm-season turf. It may harm cool-season grasses such as Kentucky bluegrass and fine fescue.

How often should I apply Certainty Herbicide?

For persistent weeds, a **follow-up application** may be necessary **four or more weeks** after the first treatment.

Where can I find the full application instructions?

Always refer to the **product label** for complete mixing, application, and safety guidelines.

Documents / Labels

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