Pre-Emergent Herbicides in Lawns
Find this article at:
go.ncsu.edu/readext?773964
go.ncsu.edu/readext?773964
To prevent summer weeds such as crabgrass pre-emergent herbicides should be applied in mid-February through mid-March.
The North Carolina Ag Chemical handbook will tell you exactly what products to use.
The following is a handy calendar for turf care locally: