Organic Nutsedge Control in Arizona Lawns: Building Soil Health to Suppress Weeds

The Weed

Nutsedge (nutgrass) invading new sod in Arizona. It’s a perennial sedge, not a grass—triangular stem, tubers (nutlets) that make it tough to eradicate.

Organic Strategy: Same as Crabgrass

Charlotte’s program works on nutsedge because rich, microbe-rich soil suppresses all weeds. Nutsedge thrives in wet, compacted, low-fertility soil. Fix the soil, the weed fades.

Program Recap

• Sugar 4–5 lbs/1,000 sq. ft. (repeat in 2 weeks if needed).
• Deep weekly watering (6+ inches) – but avoid overwatering, which nutsedge loves. Let soil dry between cycles.
• Corn gluten meal at forsythia bloom (spring pre-emergent).
• Alfalfa meal, lava sand for nutrients.
• Baking soda spray if fungal issues appear.

Physical Removal (Supplement)

Hand-pull young plants before they form tubers. Dispose of entire plant—don’t compost. Persistence reduces the tuber bank over time.

Patience Pays

Year 1: significant reduction. Year 2–3: near elimination. No chemicals, safe for kids/pets, soil improves every season.