Pre-Emergent Herbicides work by creating a vapor barrier that controls weed growth prior to new weeds germinating. Spring applications need to be performed in late February into March as temperatures begin to reach 55*F. Getting a pre-emergent down early will fight off new weeds that may be lurking in your soil and in some instances control young weeds that have not actively began growing depending upon the product make up used.

This is the most important aspect of using a pre-emergent herbicide: effective timing for the control of weeds prior to them emerging from the soil.

Most pre-emergent herbicides used residentially today come in a granular form and are packaged with a fertilizer. This makes distributing them via by broadcast spreader simple and effective. This is the method of delivery Winkler’s uses for Round 1 of our Turf Management program.


Here are a couple of things to keep in mind when performing a herbicide application beyond timing:

  • Aerating or disturbing the soil after applying a pre-emergent breaks the vapor barrier and reduces the effectiveness of the application.
  • Follow the label of your product on the packaging.
  • Protect yourself, kids, and pets while using products.
  • Do not apply on new sod.
  • Water the lawn regularly prior and following.
  • Secondary applications may be needed as product loses effectiveness over time.
  • Pre-emergents will neutralize seed that has not germinated.

We hope that this helps you as you plan your spring maintenance chores around your lawn and landscape. If you ever feel these types of things are confusing, or you simply don’t have time to do the proper applications for your lawn, contact us and we’ll help make caring for your lawn easy.

Contact Winkler’s Lawn Care & Landscape!