Fertilizer Burn on New Fescue Sod: Diagnosis and Recovery

What Happened

In Chilliwack, BC, Scott’s Winterguard (24-3-12) was applied to two-month-old fescue sod. The front lawn thrived; the back turned gray-brown overnight, 8 days post-application. The spreader may have over-applied, but the front’s success suggests a soil difference.

Likely Causes

• Excessive nitrogen on the back yard—either from spreader malfunction or pre-existing high soil N.
• Poor drainage or compaction in the back, concentrating salts in the root zone.
• Different soil texture/organic matter between front and back.

Immediate Steps

1. Water heavily (1–1.5 inches) to leach salts below the root zone. Repeat every 2–3 days for two weeks.
2. Soil test both areas (pH, EC, nutrient levels) to confirm salinity or nutrient imbalance.
3. Plant tissue analysis on surviving grass to detect specific toxicities.

Reseeding Timeline

If the sod is dead (tug test: no resistance), wait until spring (April–May) to reseed. Fall seeding in BC risks winterkill. Keep the area mulched with straw over winter to prevent erosion.

Prevention

• Calibrate spreader before every use.
• Use slow-release organic fertilizers (e.g., 8-2-4) on new sod—never high-N synthetics.
• Wait 4–6 weeks after sodding before any fertilization; the sod farm already fertilized.