A reader said he had heard of the practice of shredding leaves prior to using them as mulch but wondered about the reason behind it. Was it just to make it easier to dispose of the leaves, since, once shredded, the load would be more compact? Or was there some other benefit?
The best weapon you have against this annual weed is crabgrass preemergence herbicide (also called crabgrass preventer). You apply this product in the spring before the crabgrass seed sprouts. This granular herbicide works by creating a chemical barrier at the surface of the soil. As the seeds begin germination, they take in the herbicide and die.