One heavy rate application applied in the spring to control crabgrass break through. If needed, a second application would be applied based on your lawns condition. Pre-emergent can also be used in the fall to control certain annual grasses and broadleaf weeds if needed.
These are applied where needed to control broadleaf weeds, grassy weeds and outbreaks on a “spot spray basis” only. Complete broadcasting is done only if absolutely necessary.