Green kyllinga is a warm-season perennial sedge that forms dense mats in lawns, sports fields, and golf courses across the southern United States. It spreads through underground rhizomes and produces viable seeds, and it tolerates close mowing better than most turfgrasses. Because it is a sedge, standard broadleaf herbicides do not control it.
Effective green kyllinga control requires herbicides labeled for sedges, not broadleaf weeds. Pre-emergent products prevent seeds from germinating, while post-emergent products kill existing plants and stop rhizome spread. Combining both approaches delivers the most reliable long-term control in lawns and sports turf.
Green kyllinga is often confused with other sedges and with dallisgrass, so identifying it correctly before treatment matters. It thrives in moist, poorly drained soils and in thin turf where competition from desirable grasses is low. Improving drainage and turf density reduces future infestations.
In this guide, we review the best herbicides for green kyllinga by examining pre-emergent and post-emergent options, application timing, and cultural practices for long-term control.
Best Herbicide For Green Kyllinga: Top 15 Options
1. Halosulfuron – Best Overall Post-Emergent Herbicide
Halosulfuron is the best overall post-emergent herbicide for green kyllinga because it selectively controls sedges without harming most warm-season and cool-season turfgrasses. It is absorbed through leaves and roots and translocated to growing points, disrupting cell division. It is highly effective on green kyllinga, yellow nutsedge, and purple nutsedge.
- TRUSTED PERFORMER: Empero contains 75% halosulfuron-methyl; the active ingredient professionals trust most for control of tough nutsedge.
- TOTAL NUTSEDGE TAKEDOWN: Empero travels down to the root system tubers for complete top-to-bottom weed kill.
Halosulfuron is labeled for lawns, sports fields, and golf courses to control green kyllinga and other sedges. It works best when applied to actively growing sedges in late spring or early summer. It is often tank-mixed with other herbicides for broader spectrum control.
This product has some soil residual activity that helps prevent new sedge tubers from emerging. It is safe for most turfgrasses when applied according to label directions.
- Controls green kyllinga
- Safe for most turfgrasses
- Absorbed and translocated
- Some soil residual
- Works in lawns and sports fields
- Reduces repeat applications
- Trusted by turf managers
- Some soil residual
- Requires even coverage
- Drift risk to desirable plants
2. Sulfentrazone – Best For Fast Contact Control
Sulfentrazone is a fast-acting contact herbicide that controls green kyllinga and other sedges in turf. It is absorbed through roots and shoots and disrupts cell membranes, causing rapid wilting and collapse of treated plants. It has both pre-emergent and post-emergent activity.
- STOP WEEDS BEFORE THEY START: This pre-emergent and post-emergent herbicide targets weed seeds just as they're germinating; Say goodbye to troublesome weeds like crabgrass and creeping charlie before they take over your lawn or garden
- COST-EFFECTIVE: With low usage rates, our product provides an economical weed-killing solution, ideal for both small and large areas
Sulfentrazone is labeled for lawns, sports fields, and golf courses to control green kyllinga and other sedges. It works best when applied to actively growing sedges in late spring or early summer. It is often tank-mixed with other herbicides for broader spectrum control.
This product has significant soil residual activity that contributes to its pre-emergent effect. It requires even coverage for effective results and works best on small, actively growing sedges.
- Fast contact action
- Pre and post-emergent activity
- Safe for most turfgrasses
- Some soil residual
- Works in lawns and sports fields
- Tank-mix flexibility
- Trusted by turf managers
- Some soil residual
- Requires even coverage
- Drift risk to desirable plants
3. Imazaquin – Best For Residual Sedge Control
Imazaquin is a selective herbicide that controls green kyllinga and other sedges in turf. It is absorbed through roots and leaves and translocated to growing points, disrupting cell division. It has both pre-emergent and post-emergent activity on sedges and some broadleaf weeds.
- BROAD-SPECTRUM WEED CONTROL: The weed and grass killer concentrate is effective at controlling a wide range of weeds, including vines and hardwood brush. Ideal for forestry and rangeland, it provides lasting protection and eliminates tough vegetation
- VERSATILE APPLICATION METHODS: This weed and grass killer can be applied using multiple methods: broadcast, targeted handgun, low volume, cut stump, or basal application. It offers a flexible application for both large areas and specific vegetation
Imazaquin is labeled for lawns, sports fields, and golf courses to control green kyllinga and other sedges. It works best when applied to actively growing sedges in late spring or early summer. It is often tank-mixed with other herbicides for broader spectrum control.
This product has significant soil residual activity that helps prevent new sedge tubers from emerging. It requires careful application to protect desirable turf species and comply with label directions.
- Pre and post-emergent activity
- Controls green kyllinga
- Absorbed and translocated
- Long soil residual
- Reduces repeat applications
- Works in lawns and sports fields
- Trusted by turf managers
- Long soil residual
- Not safe for all turf species
- Requires even coverage
4. Metolachlor – Best Pre-Emergent For Sedge Prevention
Metolachlor is a pre-emergent herbicide that prevents green kyllinga and other sedge seeds from germinating in turf. It is absorbed by emerging seedlings and disrupts cell division. It has no post-emergent activity on established sedges.
- Timing flexibility: pre-plant surface-applied, pre-plant incorporated, pre-emergence and post-emergent treatment
- Contains 7.8 pounds of Metolachlor per gallon
Metolachlor is labeled for lawns, sports fields, and golf courses to prevent green kyllinga and other annual sedges. It works best when applied in early spring before soil temperatures warm and sedge seeds germinate. It is often tank-mixed with other pre-emergent herbicides for broader spectrum control.
This product has significant soil residual activity that prevents new sedges from germinating for months. It is safe for most turfgrasses when applied according to label directions.
- Prevents sedge germination
- Safe for most turfgrasses
- Long soil residual
- Reduces post-emergent applications
- Works in lawns and sports fields
- Widely available
- Trusted by turf managers
- No post-emergent activity
- Requires proper timing
- Long soil residual
5. Prodiamine – Best Pre-Emergent For Lawns
Prodiamine is a pre-emergent herbicide that prevents green kyllinga and other sedge seeds from germinating in lawns and sports fields. It is absorbed by emerging seedlings and disrupts cell division. It has no post-emergent activity on established sedges.
- Crabgrass Control
- Pre-emergent and broadleaf weed control
Prodiamine is labeled for lawns, sports fields, and golf courses to prevent green kyllinga and other annual sedges. It works best when applied in early spring before soil temperatures warm and sedge seeds germinate. It is often tank-mixed with other pre-emergent herbicides for broader spectrum control.
This product has significant soil residual activity that prevents new sedges from germinating for months. It is safe for most turfgrasses when applied according to label directions.
- Prevents sedge germination
- Safe for most turfgrasses
- Long soil residual
- Reduces post-emergent applications
- Works in lawns and sports fields
- Widely available
- Trusted by turf managers
- No post-emergent activity
- Requires proper timing
- Long soil residual
6. Dithiopyr – Best Pre-Emergent With Early Post Activity
Dithiopyr is a pre-emergent herbicide with limited early post-emergent activity on very small green kyllinga seedlings. It is absorbed by roots and shoots and disrupts cell division. It is often used in spring to prevent summer annual sedges in turf.
- Effective Against: Annual grasses and broadleaf weeds
- Provides early post-emergent crabgrass control
Dithiopyr is labeled for lawns, sports fields, and golf courses to prevent green kyllinga and other summer annual sedges. It works best when applied in early spring before soil temperatures warm and sedge seeds germinate. It is often tank-mixed with other pre-emergent herbicides for broader spectrum control.
This product has significant soil residual activity that prevents new sedges from germinating for months. It is safe for most turfgrasses when applied according to label directions.
- Prevents sedge germination
- Safe for most turfgrasses
- Early post-emergent activity
- Long soil residual
- Reduces post-emergent applications
- Works in lawns and sports fields
- Trusted by turf managers
- Limited post-emergent activity
- Requires proper timing
- Long soil residual
7. Bentazon – Best For Post-Emergent Sedge Control
Bentazon is a selective post-emergent herbicide that controls green kyllinga and other sedges in turf. It is absorbed through leaves and translocated to growing points, disrupting photosynthesis. It controls many sedges and broadleaf weeds without harming most grasses.
- Powerful Weed Control: Fast-acting bentazon formula targets broadleaf weeds and sedges on contact; controls over 25 weed species including velvetleaf, pigweed, and nutsedge
- Active Ingredient: Contains sodium salt of bentazon 44.0% (equivalent to 4 pounds bentazon per gallon); selective post-emergence liquid concentrate
Bentazon is labeled for lawns, sports fields, and golf courses to control green kyllinga and other sedges. It works best when applied to small, actively growing sedges in late spring or early summer. It is often tank-mixed with other herbicides for broader spectrum control.
This product has limited soil residual activity, so it does not prevent new sedges from germinating. It requires good spray coverage for effective control and is not effective on all sedge species.
- Selective for sedges
- Safe for most grasses
- Absorbed and translocated
- Limited soil residual
- Works in lawns and sports fields
- Tank-mix flexibility
- Trusted by turf managers
- Requires good coverage
- No pre-emergent activity
- Limited residual
8. Trifloxysulfuron – Best For Warm-Season Turf
Trifloxysulfuron is a selective herbicide that controls green kyllinga and other sedges in warm-season turf. It is absorbed through leaves and roots and translocated to growing points, disrupting cell division. It is highly effective on green kyllinga, purple nutsedge, and some broadleaf weeds.
- Vegetation killer kills weeds and grasses down to the root
- This product is also a weed preventer and prevents regrowth for up to one year
Trifloxysulfuron is labeled for lawns, sports fields, and golf courses to control green kyllinga and other sedges. It works best when applied to actively growing sedges in late spring or early summer. It is often tank-mixed with other herbicides for broader spectrum control.
This product has some soil residual activity that helps prevent new sedge tubers from emerging. It is safe for most warm-season turfgrasses when applied according to label directions.
- Controls green kyllinga
- Safe for warm-season turf
- Absorbed and translocated
- Some soil residual
- Works in lawns and sports fields
- Reduces repeat applications
- Trusted by turf managers
- Not safe for all turf species
- Requires even coverage
- Drift risk to desirable plants
9. MSMA – Best For Selective Sedge Control
MSMA is a selective post-emergent herbicide that controls green kyllinga and other sedges in turf. It is absorbed through leaves and translocated to growing points, disrupting cell division. It is highly effective on green kyllinga and other warm-season sedges.
- Monosodium acid Methanearsonate MSMA 48.3%
- MSMA can be used on Cotton, Golf courses, Sod Farms, and highway rights of way for weed control.
MSMA is labeled for lawns, sports fields, and golf courses to control green kyllinga and other sedges. It works best when applied to actively growing sedges in late spring or early summer. It is often tank-mixed with other herbicides for broader spectrum control.
This product has limited soil residual activity, so it does not prevent new sedges from germinating. It is restricted in some states and may not be available in all areas.
- Controls green kyllinga
- Safe for most turfgrasses
- Absorbed and translocated
- Fast-acting
- Works in lawns and sports fields
- Widely used in southern turf
- Trusted by turf managers
- Restricted in some states
- Limited soil residual
- Requires even coverage
10. Metribuzin – Best For Cool-Season Turf
Metribuzin is a selective herbicide that controls green kyllinga and other sedges in cool-season turf. It inhibits photosynthesis and is absorbed through roots and leaves. It has both pre-emergent and post-emergent activity on sedges and some broadleaf weeds.
- Active Ingredient: Metribuzin 75%
- TARGET PESTS: Annual bluegrass (Poa annua), Bedstraw, Carpetweed, Chickweed, Corn speedwell, Goosegrass, Henbit, Littleseed canarygrass, Parsley-piert, Prostrate knotweed, Rabbitfootgrass, Red deadnettle, Shepherdspurse, Spotted spurge, Spur weed, White clover, Wild mustard and more
Metribuzin is labeled for lawns, sports fields, and golf courses to control green kyllinga and other sedges. It works best when applied to actively growing sedges in late spring or early summer. It is often tank-mixed with other herbicides for broader spectrum control.
This product has moderate soil residual activity that contributes to its pre-emergent effect. It can cause turf injury if applied when grasses are stressed or if rates are too high.
- Pre and post-emergent activity
- Controls green kyllinga
- Works in cool-season turf
- Moderate soil residual
- Tank-mix flexibility
- Affordable
- Trusted by turf managers
- Turf injury risk
- Requires proper timing
- Some soil residual
11. Imazosulfuron – Best For Selective Sedge Control
Imazosulfuron is a selective herbicide that controls green kyllinga and other sedges in turf. It is absorbed through leaves and roots and translocated to growing points, disrupting cell division. It is highly effective on green kyllinga and other warm-season sedges.
- BROAD-SPECTRUM WEED ACTION: Fusilade herbicide weed killer targets perennial and annual grass weeds in various settings. Safe for landscapes, nurseries, and sports fields, it controls weeds without harming ornamentals, ensuring a clean appearance
- POTENT INGREDIENTS, SUPERIOR RESULTS: Featuring 24.5% Fluazifop-P-butyl, this herbicide concentrate delivers targeted control of grass weeds. The 75.5% of other ingredients ensure coverage and performance in diverse turf and ornamental settings
Imazosulfuron is labeled for lawns, sports fields, and golf courses to control green kyllinga and other sedges. It works best when applied to actively growing sedges in late spring or early summer. It is often tank-mixed with other herbicides for broader spectrum control.
This product has some soil residual activity that helps prevent new sedge tubers from emerging. It is safe for most turfgrasses when applied according to label directions.
- Controls green kyllinga
- Safe for most turfgrasses
- Absorbed and translocated
- Some soil residual
- Works in lawns and sports fields
- Reduces repeat applications
- Trusted by turf managers
- Some soil residual
- Requires even coverage
- Drift risk to desirable plants
12. Flazasulfuron – Best For Fast-Acting Control
Flazasulfuron is a selective herbicide that controls green kyllinga and other sedges in turf. It is absorbed through leaves and roots and translocated to growing points, disrupting cell division. It is highly effective on green kyllinga and other warm-season sedges.
- TRUSTED PERFORMER: Torocity contains 40.0% mesotrione; the same active ingredient as the leading brand, Tenacity Herbicide. For more than 20 years, mesotrione has been the trusted choice for effective pre emergent and post emergent weed control for lawns in both newly seeded areas as well as established turf.
- FLEXIBLE APPLICATION TIMING: This double-hitter weed killer concentrate allows timing forgiveness with both pre- and post-emerge activity. Compared to pre-emerge only herbicides, Torocity widens the application window so you can stop new weeds before they start and take down the weeds you already have.
Flazasulfuron is labeled for lawns, sports fields, and golf courses to control green kyllinga and other sedges. It works best when applied to actively growing sedges in late spring or early summer. It is often tank-mixed with other herbicides for broader spectrum control.
This product has some soil residual activity that helps prevent new sedge tubers from emerging. It is safe for most turfgrasses when applied according to label directions.
- Fast-acting on sedges
- Safe for most turfgrasses
- Absorbed and translocated
- Some soil residual
- Works in lawns and sports fields
- Reduces repeat applications
- Trusted by turf managers
- Some soil residual
- Requires even coverage
- Drift risk to desirable plants
13. Sulfosulfuron – Best For Selective Sedge Control
Sulfosulfuron is a selective herbicide that controls green kyllinga and other sedges in turf. It is absorbed through leaves and roots and translocated to growing points, disrupting cell division. It is highly effective on green kyllinga and other warm-season sedges.
- WEED CONTROL FORMULATED FOR SOUTHERN LAWNS: Sertay contains 75% sulfosulfuron; the same active ingredient as the Leading Brand, the top herbicide for grass, broadleaf, and sedge control in warm-season turf.
- YOUR ANSWER TO SUMMER SEDGE: When you need weed control plus sedge takedown, turn to Sertay. This proven herbicide works on grassy and broadleaf weeds as well as on sedge, nutsedge, and kyllinga. Apply spring, summer, or fall to young, actively growing weeds. See the product label for application timing and directions.
Sulfosulfuron is labeled for lawns, sports fields, and golf courses to control green kyllinga and other sedges. It works best when applied to actively growing sedges in late spring or early summer. It is often tank-mixed with other herbicides for broader spectrum control.
This product has some soil residual activity that helps prevent new sedge tubers from emerging. It is safe for most turfgrasses when applied according to label directions.
- Controls green kyllinga
- Safe for most turfgrasses
- Absorbed and translocated
- Some soil residual
- Works in lawns and sports fields
- Reduces repeat applications
- Trusted by turf managers
- Some soil residual
- Requires even coverage
- Drift risk to desirable plants
14. Prodiamine + Sulfentrazone – Best Combination For Season-Long Control
Prodiamine combined with sulfentrazone provides both pre-emergent and post-emergent control of green kyllinga in turf. Prodiamine forms a soil barrier that prevents new sedge seeds from germinating, while sulfentrazone provides fast contact control of existing sedges. The combination delivers the most complete control.
- PRE-EMERGENT HERBICIDE: Quali-Pro's Prodiamine 65 WDG provides pre-emergent grass and broadleaf weed control. Flexible application allows for both spring and fall use providing season long crabgrass control. Available in a 5 pound bottle.
- FEATURES & BENEFITS: Excellent tank mix partner with fertilizers and iron solutions
Prodiamine plus sulfentrazone is labeled for lawns, sports fields, and golf courses to control green kyllinga and other sedges. It works best when applied in early spring before sedge germination and again in early summer as a post-emergent treatment. It is often used as part of a season-long control program.
This combination has significant soil residual activity from prodiamine that prevents new sedges from germinating for months. It requires even coverage for effective results and works best when applied according to label directions.
- Pre and post-emergent control
- Effective on green kyllinga
- Safe for most turfgrasses
- Long soil residual
- Reduces repeat applications
- Works in lawns and sports fields
- Trusted by turf managers
- Long soil residual
- Can affect sensitive plants
- Requires even coverage
15. Halosulfuron + Sulfentrazone – Best Combination For Tough Infestations
Halosulfuron combined with sulfentrazone provides both systemic and contact control of green kyllinga in turf. Halosulfuron moves to the roots and tubers, while sulfentrazone provides fast top-kill of existing sedges. The combination delivers more complete control than either product alone.
- Visible results in 24-48 hours
- Controls weeds both pre- and post-emergence
Halosulfuron plus sulfentrazone is labeled for lawns, sports fields, and golf courses to control green kyllinga and other sedges. It works best when applied to actively growing sedges in late spring or early summer. It is often used for tough infestations that have not responded to single-product treatments.
This combination has significant soil residual activity from both ingredients that helps prevent new sedges from germinating. It requires careful application to protect desirable turf species and comply with label directions.
- Systemic and contact action
- Effective on green kyllinga
- Safe for most turfgrasses
- Long soil residual
- Reduces repeat applications
- Works on tough infestations
- Trusted by turf managers
- Long soil residual
- Not safe for all turf species
- Requires even coverage
Tips For Controlling Green Kyllinga With Herbicides
- Confirm the weed first: Confirm that the weed is green kyllinga and not yellow nutsedge, purple nutsedge, or dallisgrass, since control products vary by species.
- Use sedge-labeled herbicides: Standard broadleaf herbicides do not control green kyllinga. Use products labeled for sedges like halosulfuron, sulfentrazone, and trifloxysulfuron.
- Apply post-emergent while small: Treat green kyllinga in late spring or early summer when sedges are actively growing and before they set seed or produce new rhizomes.
- Apply pre-emergent in early spring: Prodiamine, dithiopyr, and metolachlor prevent green kyllinga seeds from germinating when applied before soil temperatures warm.
- Improve drainage: Green kyllinga thrives in moist, poorly drained soils. Improving drainage and reducing irrigation frequency helps turf outcompete it.
- Rotate modes of action: Using the same herbicide group repeatedly selects for resistant sedges. Rotate between ALS inhibitors, PPO inhibitors, and photosystem II inhibitors.
- Monitor and re-treat: Green kyllinga regrows from rhizomes and tubers. Scout treated areas several times per season and re-treat new growth while it is small.
Best Herbicide For Green Kyllinga FAQ’S
1. What is the best herbicide for green kyllinga?
Halosulfuron is the best overall post-emergent herbicide for green kyllinga because it selectively controls sedges without harming most turfgrasses. Sulfentrazone, trifloxysulfuron, and imazaquin are also effective.
2. Will 2,4-D kill green kyllinga?
No, 2,4-D does not control green kyllinga because it is a sedge, not a broadleaf weed. Use sedge-labeled herbicides like halosulfuron or sulfentrazone instead.
3. What is the best pre-emergent for green kyllinga?
Prodiamine, dithiopyr, and metolachlor are the best pre-emergent options for green kyllinga. They form a soil barrier that prevents seeds from germinating when applied in early spring before soil temperatures warm.
4. When should I spray green kyllinga?
Spray green kyllinga in late spring or early summer when the sedge is actively growing and before it sets seed. Pre-emergent products go down in early spring before germination.
5. Does green kyllinga come back after spraying?
Green kyllinga can regrow from rhizomes and tubers after post-emergent treatment. Pre-emergent herbicides and improved turf density help prevent regrowth.
6. Is green kyllinga a grass or a weed?
Green kyllinga is a warm-season perennial sedge that is considered a weed in most lawns and sports fields. It is not a grass and requires sedge-specific herbicides for control.
7. Can I use vinegar to kill green kyllinga?
Vinegar can burn green kyllinga foliage but rarely kills the rhizomes and tubers. It works best as part of an integrated program combining hand-pulling, improved drainage, and selective herbicides.
Conclusion
Halosulfuron is the best overall post-emergent herbicide for green kyllinga because it selectively controls sedges without harming most turfgrasses. Sulfentrazone, trifloxysulfuron, imazaquin, and MSMA follow closely as broad-spectrum options for lawns, sports fields, and golf courses.
For pre-emergent control, prodiamine, dithiopyr, and metolachlor prevent green kyllinga seeds from germinating when applied in early spring. Combining pre-emergent and post-emergent programs delivers the most reliable control in lawns and sports turf.
Effective control requires correct product selection, proper timing, even spray coverage, and follow-up monitoring for regrowth. Rotating modes of action prevents resistance, and improving drainage and turf density reduces future infestations.
Start your green kyllinga control program this season, choose the right product for your turf species and site, and plan for follow-up treatments each year. Consistent effort delivers a clean lawn and long-term control.