9 Best Post Emergent Crabgrass Killers 2025 in the United States

The Ortho WeedClear Lawn Weed Killer Concentrate is designed to target and eliminate common lawn weeds like dandelion, chickweed, clover, crabgrass, and foxtail. One of its main strengths is its fast-acting formula, which promises visible results with just one application. Additionally, it is effective in killing weeds down to the roots while being safe for the lawn when used according to the directions.

This makes it a reliable choice for homeowners with a variety of grass types, including Bermudagrass, Buffalograss, Fescues, Kentucky Bluegrass, Ryegrass, and Zoysiagrass. Another advantage is its coverage capacity, as a 32 fl. oz. bottle can treat up to 5,000 square feet of lawn area. However, it is essential to note that this product is a concentrate and cannot be applied directly from the container; careful attention must be paid to the instructions for proper mixing and application.

As with any herbicide, there are environmental and safety concerns to consider, particularly ensuring that it doesn’t affect non-target plants or wildlife. For those looking for a powerful, fast-acting weed killer that targets a broad spectrum of weeds without damaging the grass, this Ortho product could be a solid option, but users should be prepared for the extra step of mixing and careful application.

The Spectracide 1.33 Gallon Weed Stop For Lawns Plus Crabgrass Killer AccuShot Refill is a versatile weed killer designed for lawn use. One of its primary strengths is its fast-acting formula, which promises visible results in as little as five hours. It targets over 470 types of weeds, including common nuisances like dandelions, chickweed, clover, crabgrass, and yellow nutsedge, making it a comprehensive solution for various weed problems. Additionally, it kills weeds down to the root, ensuring more effective and long-lasting results without harming the lawn when used as directed.

This product is a liquid formulation, making it easy to apply with the AccuShot Sprayer, which simplifies the process and improves precision. It's particularly convenient as a refill option, which can save time and reduce waste. Users should be aware of its suitability for specific weed types and lawn conditions by consulting the product label.

Weighing in at 11.58 pounds and covering a wide range of weed types, this product is ideal for homeowners seeking an efficient and broad-spectrum weed control solution without damaging their lawns.

The Syngenta Tenacity Herbicide is a versatile liquid weed killer designed for lawns and turf grasses. One of its primary strengths is the active ingredient, Mesotrione, which provides broad-spectrum control over 46 types of weeds and grasses, including crabgrass, goosegrass, and dandelion. This makes it a powerful option for maintaining a healthy lawn.

Its selective pre- and post-emergent control capabilities mean it can target existing weeds while preventing new ones from emerging, and it is safe to use around the time of seeding, which adds to its flexibility. The ease of measurement and application is another plus, as the design of the bottle ensures precise dosing without the need for additional tools.

However, the product’s effectiveness and safety need to be balanced with environmental impact considerations, as it is a chemical herbicide. At 8 ounces, the product covers a significant area but is relatively small in volume, so larger lawns may require multiple purchases.