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. BEST FOR ZOYSIA GRASS: Ortho Weed Be Gon Plus Crabgrass Control Concentrate.BEST FOR CENTIPEDE GRASS: SOUTHERN AG ATRAZINE St.BEST FOR FLOWER BEDS: Preen Garden Weed Preventer.BEST POST-EMERGENT: BASF Drive XLR8 Crabgrass Herbicide.BEST PRE-EMERGENT: Scotts Halts Crabgrass and Grassy Weed Preventer.BEST BANG FOR THE BUCK: Spectracide 511072 Weed Stop for Lawns + Crabgrass.BEST OVERALL: Preen Lawn Crabgrass Control.Read on for our guide to navigating the available options and our top recommendations for the best crabgrass killers. It favors the thin and bare spots on your lawn.īut, the best crabgrass killer for your lawn will depend on when you apply the product and how bad your crabgrass infestation gets.The weed can grow vigorously in hot, dry conditions.A single crabgrass plant can produce 150,000 seeds during the growing season.Ungerminated seeds live in the soil for up to 30 years before sprouting. It germinates when soil temperatures reach between 55 and 65 degrees Fahrenheit, the average temperature during the spring and fall seasons in most areas.When it comes to battling crabgrass on the lawn, the odds are stacked in the weed’s favor: Remarks Avoid drift to sensitive crops and desirable vegetation.Crabgrass gets its name from how it grows-low to the ground with stems that radiate out from the center of the grass clump, resembling crab legs. Time Apply when the buttercup is growing well. Site of action (diflufenzopyr) Group 19: inhibits indoleacetic acid transport (dicamba) Group 4: synthetic auxinĬhemical family (diflufenzopyr) Semicarbazone (dicamba) Benzoic acid Do not exceed 10 oz/A of Overdrive per season. Remarks For improved uptake if weeds are under moisture or temperature stress, use a nonionic surfactant or a methylated seed oil.Ĭaution Do not plant any crop within 30 days of application. Site of action (aminocyclopyrachlor) Group 4 synthetic auxin (chlorsulfuron) Group 2: ALS inhibitorĬhemical family (aminocyclopyrachlor) Pyrimidine carboxylic acid (chlorsulfuron) Sulfonylurea Can injure several grass species including bromes, as well as basin wildrye. Can be applied using an invert emulsion rather than water.Ĭaution Even low rates can kill nontarget tree and shrub species, so avoid application within a distance equal to the tree height of the sensitive species. Remarks Adjuvants can be used these include methylated seed oils 0.5 to 1% v/v, nonionic surfactants at 0.25 to 1% v/v, and crop oil concentrates at 1% v/v. Time Apply to actively growing vegetation. Rate 1.2 to 1.8 oz/A aminocyclopyrachlor + 0.5 to 0.7 oz/A chlorsulfuron (3 to 4.5 oz/A of product) Aminocyclopyrachlor + chlorsulfuron (Perspective)
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