Depends on the weed and the ground cover the weeds are competing against. For many weeds, simply mowing them in the presence of decent ground cover is complete

Depends on the weed and the ground cover the weeds are competing against. For many weeds, simply mowing them in the presence of decent ground cover is completely effective, as they’re optimized to grow tall quickly - defoliate them at the right time and they’ve already spent their energy reserves.