A product labeled as a “grassy weed killer” may or may not control crabgrass, and it may or may not be rated for use in the area you plan to apply it. Selective herbicides control specific weed categories, like “grassy weeds” or “broadleaf weeds.” The ingredients in these kinds of weed killers should be safe for nontarget plants like lawn grass while killing target plants like dandelions and crabgrass.Īlways read labels on selective herbicides to be sure they will work for you. Herbicides come as either selective or nonselective formulas. Consider the options below before selecting the best crabgrass killer for your needs. A final part of the decision boils down to how many square feet you need to treat. Do you want a product to kill several types of weeds or target crabgrass specifically? Will you apply the herbicide in the growing season or during its dormant season? Homeowners should consider whether they want to kill crabgrass in an established lawn or a recently seeded one. Selecting the best crabgrass killer for your lawn depends on several factors. What to Consider When Choosing the Best Crabgrass Killer Again, it might take multiple applications to kill weeds like crabgrass, depending on the time of year, weather conditions, weed maturity, and other site-specific conditions. The pre-emergent halts germination that has not yet occurred while the post-emergent herbicide kills the existing weeds. Mature weeds might require multiple applications, which can also stress the lawn or other plants in the area.įor weedy lawns, the best strategy combines pre-emergent and post-emergent herbicides for a full attack. They prove most effective for tough-to-kill weeds like crabgrass if applied when the weed is young and tender. Post-emergent herbicides kill weeds that are present (after they have emerged from the seed). Pre-emergent herbicides have a defined effectiveness period, so it might become necessary to apply pre-emergent herbicides several times per season to keep the area weed-free.īob Vila has partnered with Sunday to get your lawn exactly what it needs to thrive. In areas with long growing seasons, crabgrass can germinate for a long season as well. Applying pre-emergents after the seeds germinate will fail at controlling the target weed. If the herbicide goes on too early, before the soil temperature warms up enough, the pre-emergent will dissipate before it can complete the job. Homeowners must apply the herbicide when the weed seed is just about ready to germinate. The timing of the pre-emergent application is very important. Pre-emergents do not kill existing weeds. When properly applied, they do the job of controlling annual weeds-those that grow from seed each year and then die at the end of the growing season. Pre-emergent herbicides, or weed preventers, stop weed seeds from germinating. However, it also depends on the time of year that you plan to tackle the weed. The best overall product will take care of crabgrass and other weeds that are choking out your lawn. The preventive type keeps seeds from germinating and the other type kills mature plants.
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