Controlling weeds involves more than spraying a weed killer or herbicide. There are several types of weeds and several types of herbicides.
Weeds can be either broadleaf or grasses.
Common examples or each type are illustrated. Within each of these two types, weeds may be annual or perennial. Total vegetation killers kill any type of vegetation they land on. Perennial broadleaf weeds are controlled with post-emergent herbicides. When the weeds are young and actively growing they absorb the herbicide readily, giving good control.