Nutsedge Control: Why Sugar Fails and What Actually Works

Multi-year nutsedge battle. Pulled, tried corn gluten (failed, expensive), now considering sugar at 4 lbs/1000 sq ft via Scotts Easy 2000 rotary spreader. Asking if spreader works and setting rate.

Nutsedge Biology: Why It's Nearly Unstoppable

• Guinness Record: most widespread weed on Earth.
• Reproduces by: basal shoots, rhizomes, deep tubers (nutlets).
• One Wisconsin field: 35.2 million yellow nutsedge tubers/acre.
• Tubers dormant 3–7 years; survive herbicides, pulling, freezing.

Sugar: No Scientific Basis for Control

Theory: carbon feeds microbes → nitrogen immobilization → favors low-N plants. Reality: nutsedge thrives in low N, has massive energy reserves in tubers. Sugar feeds microbes but doesn't touch established nutsedge.

Spreader Issue Is Moot

Don't waste sugar, money, or spreader calibration time on nutsedge.

Effective Nutsedge Management

1. Halosulfuron (SedgeHammer, Manage): Selective for sedges in turf. Multiple applications needed.
2. Sulfentrazone (Dismiss, SureZone): Faster action, broader spectrum.
3. Imazaquin (Image): For warm-season grasses only.
4. Glyphosate spot treatment: In beds/hardscapes. Wiper application reduces collateral damage.
5. Cultural: Improve drainage (nutsedge loves wet), mow high, reduce compaction.

Persistence Is the Only Strategy

No single treatment eradicates nutsedge. Multi-year integrated approach: herbicide rotations + drainage + vigilance.