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.
To get rid of crabgrass and ensure that it doesn’t return, the best offense is a strong defense. Early in the spring, when the crabgrass has all died back over the course of winter, apply a preemergent herbicide, which contains chemicals that are designed to kill weed seeds before they even sprout. Be careful, though. Some products of this will kill not only weed seeds, but all seeds. Take the time to be certain you are purchasing a product that accommodates your lawn-care plans.
To be absolutely sure that you’re using the most effective means of controlling crabgrass, consult your local garden supply store. Carefully explain what exactly you’re trying to achieve—specifically mention crabgrass—and ask someone at the store for the best recommendation for your situation.
While preemergent herbicides address the problem of crabgrass in a direct way, you can successfully minimize weeds simply by growing the fullest, healthiest lawn that’s within your power to cultivate. Crabgrass cannot take root on a lawn where it literally has no room to grow. That said, it’s virtually impossible to eliminate lawn weeds entirely, so if you wish to supplement your application of preemergent herbicide, try any—or a combination—of the following methods:
• Being that crabgrass has shallow roots, its growth can be curtailed by watering the lawn deeply but infrequently.
• Close-cropping the lawn leaves it vulnerable to weeds of all types; set your mower blades a few inches higher.
• There’s nothing wrong with old-fashioned weeding; make it easier on yourself by watering the lawn first.
• If crabgrass grows despite your best efforts, spray the weeds directly with a post-emergence herbicide.
If you regularly care for your lawn and give it extra attention at certain pivotal times of year, then you can maintain beautiful green grass with a minimum of imperfections. Imagine the joy you’ll feel as you proudly survey your picture-perfect lawn, the best in the neighborhood. Now quit daydreaming, and get to work!