Post emergence Certainty
"I followed the instructions when applying the product, that was 8 days ago, the poa annua is just beginning to turn yellow. This is a very slow process but it is what it is."
Certainty Herbicide (Selective Warm-Season Turf Herbicide)
Professional-grade control of nutsedge, Poa annua, and invasive cool-season grasses in warm-season lawns.
$139.99
Make It Easy – Auto Delivery Program
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.
| Key | Value |
|---|---|
| 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 |
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Choose OptionsOverall rating: 5.0 / 5 from 2 reviews.
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Post emergence Certainty
"I followed the instructions when applying the product, that was 8 days ago, the poa annua is just beginning to turn yellow. This is a very slow process but it is what it is."