Killing Weedy Fescue Before Sodding: Fast Turnaround

Want to replace weedy fescue lawn with new sod. Need herbicide that allows sodding soon without months of waiting.

Glyphosate: The Standard Solution

• Active ingredient in Roundup and generics.
• Broad-spectrum, systemic (moves to roots).
• No soil residual activity—safe for sod rooting.
• Wait 7–10 days for full translocation.

Process

1. Mow existing vegetation low.
2. Apply glyphosate at label rate for perennial weeds.
3. Wait 7–10 days. Vegetation browns completely.
4. If heavy thatch/debris: mow and bag, or rake off.
5. Lay sod directly on dead material (decomposes into organic matter).
6. Water new sod immediately and frequently.

Critical Success Factors

• Apply to actively growing weeds (not drought-stressed).
• Don't mow 3 days before/after application (need leaf surface).
• No rain/irrigation for 6+ hours post-application.
• Ensure complete coverage—missed spots = weeds in new sod.

Alternative: Solarization (If Time Allows)

Clear plastic 4–6 weeks in hot sun. Kills seeds too. But glyphosate is faster.