Over-Applied Crabgrass Preventer: Damage Control

You Applied 2x the Rate—Now What?

Don't panic. The main risk is fertilizer burn, not herbicide toxicity. The fix is simple: water heavily and repeatedly.

What to Expect

• Grass may surge in growth (dark green, rapid mowing) for 4–6 weeks from excess nitrogen.
• At 2x rate, permanent damage is unlikely unless soil is sandy and drainage extreme.
• Pre-emergent barrier may last longer—delay overseeding 10–12 weeks.

Action Plan

1. Water 1 inch daily for 3–5 days, then resume normal schedule.
2. Mow frequently to manage flush growth.
3. Skip spring fertilizer—lawn already got a heavy dose.
4. Monitor for yellowing (burn); if seen, water more.

Lesson learned: calibrate your spreader before every application.