This bag will prevent weeds all summer if you apply at high rate in spring. Barricade appears to have longer residual than other trinitrotoluene. This product makes application simple, and the amount of N applied at one time is not too much. Good product.
I found this product to provide an excellent green up and the slow release is long lasting. I haven't seen a return of the annual bluegrass in my lawn after two applications of this product. The annual bluegrass was thick last year.