10 Best Post Emergent Crabgrass Killers 2025 in the United States

Roundup For Lawns₂ Concentrate is a liquid weed killer designed specifically for northern grasses like Kentucky Bluegrass, Ryegrass, and Fescues. It effectively targets a wide range of common weeds, including crabgrass, dandelion, and poison ivy, providing up to three months of weed control when used as directed. Since it starts working immediately and becomes rainproof within three hours, it offers good convenience and reliability in various weather conditions.

Being a concentrate, it requires mixing with water before application, which might be slightly less convenient than ready-to-use sprays but allows for coverage of up to 5,000 square feet. The product is selective, meaning it’s safe for use on listed lawn grasses without harming them, which is important to protect your healthy turf. The label booklet should be carefully checked to ensure compatibility with your specific grass type.

The formula is strong and targets roots for long-lasting control. Users should handle it with care and follow instructions closely to minimize any safety or environmental risks. This product is a solid choice for homeowners looking to manage crabgrass and other tough weeds in northern lawns, offering effective and lasting results with a bit of preparation needed for application.

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.