Do You Need to Apply Pre-Emergent Every Year?

The good news is that once you’ve successfully controlled crabgrass and other annual weeds in your lawn, you can reduce your applications; you do not have to apply pre-emergent herbicide every year. Then, instead of treating your entire lawn, simply spot-spray any problem areas if new weeds appear. This targeted approach helps maintain a healthy, weed-free lawn without unnecessary chemical use. 

Here is a video from Allyn with more details:  

 Link to video: https://youtu.be/kanhGFTNTHA