10 Best Crabgrass Killers 2025 in the United States

The Roundup Weed & Grass Killer₄ Refill is a versatile herbicide designed to tackle tough weeds and grasses like crabgrass, dandelion, and poison ivy to the root. Its active ingredients include Triclopyr, Triethylamine Salt, Fluazifop P-Butyl, and Diquat Dibromide, which are effective against a wide range of broadleaf weeds and grasses. This product is easy to apply, coming in a spray form that is rainproof within 30 minutes and shows visible results in just a few hours.

It covers an area of 375 square feet per 1.25 gallons, making it suitable for use in and around flower beds, trees, driveways, walkways, and more. You can even start planting 1 to 30 days after application, depending on the specifics, which adds to its convenience. However, it's important to consider that this product is not exclusively tailored to lawn care but more for general weed killing around various areas.

Lawn compatibility might be a concern, as using it on a lawn could harm the grass you want to keep. Additionally, while it is effective, users should handle it with care due to its potent chemicals, considering the environmental impact and safety precautions. The Roundup Weed & Grass Killer₄ Refill is a practical and effective choice for those looking to manage weeds in a variety of settings beyond just their lawn.

The Spectracide Weed and Grass Killer Concentrate is designed for use on patios, walkways, and driveways, rather than lawns. This makes it ideal for users looking to clear weeds and grasses from hardscaped areas. Its fast-acting formula shows visible results within 3 hours, and its rainfast feature ensures effectiveness even after rainfall or watering 15 minutes post-application.

The concentrate form requires mixing and application with a tank sprayer, which may require additional effort and equipment, but allows for thorough coverage of target vegetation. This product is non-selective and broad spectrum, meaning it will kill a variety of weeds and grasses, not just crabgrass. However, it may not be suitable for use on lawns due to its non-selective nature, which could harm desirable grass and plants.

The ease of use is moderate given the need for a sprayer, but the visible results and effectiveness make it a strong option for those who need quick and reliable weed control on non-lawn surfaces. In terms of environmental impact, it is important to consider potential runoff and its effects on nearby plants and water sources.

The Ortho WeedClear Lawn Weed Killer Concentrate is a liquid herbicide designed to tackle crabgrass, dandelions, clover, and other common lawn weeds. It works quickly, showing results after just one application by killing weeds down to their roots, which helps prevent them from growing back. This product is safe for use on many popular lawn grasses such as Bermudagrass, Kentucky Bluegrass, and Zoysiagrass, making it a versatile choice for various lawn types. Since it is a concentrate, it needs to be diluted properly before applying, which might require some care to ensure correct mixing. The manufacturer advises following the label instructions closely to avoid damaging your lawn.

It covers a large area (up to 5,000 square feet), which is convenient for medium to large lawns. The product has a solid reputation with a good customer rating of 4.1 out of 5. However, as with many chemical weed killers, there might be concerns about environmental impact and safety, so cautious use and adherence to instructions are important. For someone looking for a fast and reliable solution to common lawn weeds including crabgrass, this product does a good job but requires careful handling and proper application.