Can You Apply Pre-Emergent Before or After Installing New Sod?

If you’ve just installed new sod or are planning to, you might be wondering about the best timing for pre-emergent herbicide to keep weeds at bay. Here’s what you need to know:

Should You Apply Pre-Emergent Before Laying Sod?

No, you should not apply pre-emergent herbicide before installing new sod. While pre-emergents are designed to prevent weed seeds from germinating, they can also inhibit the establishment of new sod roots and stolons, potentially harming your lawn’s growth.

When Can You Apply Pre-Emergent After Laying Sod?

• Warm-Season Sod (St. Augustine, Centipede, Zoysia, Bermuda, Bahia): Wait at least one full year after installation before applying any pre-emergent herbicide. This allows your new sod to fully root and establish.
• Cool-Season Sod (Kentucky Bluegrass, Perennial Ryegrass, Turf Type Tall Fescue): Wait until your new sod has gone through one complete winter before applying pre-emergent. This ensures your lawn is strong enough to handle the treatment.

Following these guidelines will help your new sod thrive and keep your lawn healthy and weed-free in the long run.

Here is a video of Allyn answering these questions with additional details as well: 

Link to Video: https://youtu.be/UVG-NlslByE 

How to Control Weeds After Installing New Sod

Wondering how to manage weeds in your newly installed sod? Most sod farms apply a pre-emergent herbicide before delivery, which provides initial weed protection. However, you’ll still need a solid post-emergent weed control strategy for any weeds that appear as your sod establishes.

For best results, wait until your new sod has developed strong roots and has been mowed 3-4 times before applying any post-emergent herbicide. Always check the product label to ensure it’s safe for your specific grass type and follow all application instructions. This approach will help keep your new lawn healthy and weed-free as it becomes established.