How to Kill Green Kyllinga in Tall Fescue Without Hurting Your Lawn
Direct Agronomic Answer
To selectively kill Green Kyllinga in Tall Fescue without damaging your turf, apply SedgeHammer+ (Halosulfuron-methyl 5%) when air temperatures are between 60°F and 90°F.
Kyllinga forms aggressive mats under close mowing. Two applications of SedgeHammer 4 to 6 weeks apart destroy the extensive rhizome network.
1. Labeled Safe Herbicides That Kill Green Kyllinga in Tall Fescue
| Recommended Product | Active Ingredient & Group | Application Temp (°F) | Surfactant & Mixing Protocol | Where to Buy |
|---|---|---|---|---|
| SedgeHammer+ EPA Reg. 81880-24-10163 |
Halosulfuron-methyl 5% Group 2 (ALS Inhibitor / Sulfonylurea) |
60°F – 90°F Rainfast: 4h |
SedgeHammer+ single-scoop pouches already contain a built-in non-ionic surfactant. If using bulk SedgeHammer 75WG, add 2 tsp NIS per gallon. | Check Price at DoMyOwn View on Amazon |
2. What NOT to Spray on Tall Fescue When Treating Green Kyllinga
Warning: Common Green Kyllinga Killers That Damage Tall Fescue
Many retail herbicides advertised for Green Kyllinga are formulated for different turf zones and will severely injure Tall Fescue:
- AVOID Certainty Turf Herbicide (Sulfosulfuron 75%): Rated 'avoid' on Tall Fescue — high risk of turf phytotoxicity or stunting.
- AVOID Image Kills Nutsedge (Imazaquin 3.3%): Rated 'avoid' on Tall Fescue — high risk of turf phytotoxicity or stunting.
3. Optimal Seasonal Timing & Temperature Thresholds
Treat in early summer when daytime temperatures reach 70°F–85°F and plants are actively growing.
Ensure a non-ionic surfactant is included in the mix to coat the shiny waxy foliage.
4. Diagnostic Checklist: Confirm It Is Green Kyllinga Before Spraying
- Low-growing, mat-forming perennial sedge with dark green triangular stems
- Sweet, aromatic fragrance emitted from creeping rhizomes when crushed
- Single, compact, globe-shaped green seedhead subtended by three long leafy bracts
Not 100% sure? Use our AI Photo Weed Scanner or review the full Green Kyllinga Botanical Profile.