Crabgrass is the weed that haunts warm-season and cool-season yards alike, sprouting in the thin spots where your turf struggles most. If you have watched those ugly, sprawling clumps muscle out your bluegrass or fescue, you already know the frustration. The right product, timed to your grass type and your region, can turn that battle around without harming the lawn you have worked to build.
The Main Contenders
Target 6 Plus (MSMA) 48.2% Turf Herbicide 5-Gallon Case
Southern Ag Surfactant for Herbicides Non-Ionic 1 Gallon
Roundup Weed and Grass Killer₄ Concentrate 64 fl. oz.
Quali-Pro Prodiamine Pre-Emergent Herbicide 5 lbs
Roundup Concentrate Plus Weed and Grass Killer 64 oz.
Ortho WeedClear Lawn Weed Killer Ready-to-Use 1.33 gal.
Ortho WeedClear Lawn Weed Killer Ready-to-Spray 32 fl. oz.
The Picks, Examined More Closely
This is a post-emergent herbicide built for serious turf work. The active component, MSMA (Monosodium acid methanearsonate), is an organic arsenic compound that has been used for decades on golf courses, sod farms, and highway rights-of-way to control crabgrass, dallisgrass, and nutsedge after the weeds have already emerged.
You mix it at roughly two ounces per gallon of water for general spraying, then dial the rate up or down based on what the label lists for your target weed. The two 2.5-gallon jugs give you enough volume to handle large residential lots or several rounds of treatment across a full growing season.
Real Benefits
- Targets crabgrass, dallisgrass, johnsongrass, and nutsedge that have already broken through the soil
- Concentrated formula stretches across multiple applications from a single case
- Trusted by turf professionals for use on golf-style turf where selective control matters
- Works as a post-emergent, meaning you spray the weed you can see rather than guessing at timing
Points To Keep In Mind
- Label restrictions and personal protective equipment (gloves, long sleeves, eye protection) are non-negotiable with arsenical herbicides
- Storage of two large jugs takes a garage corner and a cool, dry spot away from pets
- Mixing precision matters; over-application can stress desirable turf, especially in warm-season grasses during heat
The Right Fit
Experienced homeowners managing acreage, sod-farm-style turf, or properties with stubborn perennial grassy weeds will feel right at home here.
Look Elsewhere When
Casual weekend gardeners on a small suburban lot should reach for the Ortho WeedClear Ready-to-Use instead, since the mixing step alone is enough to put most casual users off.
A surfactant is not a herbicide on its own. Instead, it is a wetting agent that reduces the surface tension of your spray solution so droplets spread across waxy weed leaves rather than beading up and rolling off. The Southern Ag jug delivers an 80% non-ionic surfactant (NIS), meaning it does not react chemically with the herbicide you pair it with.
Most lawn-care veterans call it “sticker-spreader” shorthand because that is exactly what it does. The gallon size means you can pour off small amounts into your tank for years without running out, and the bottle stores easily next to your other concentrates.
The Helpful Details
- Plays well with common herbicides like 2,4-D, Trimec, and atrazine without neutralizing them
- Improves leaf coverage on crabgrass and other weeds with waxy, water-repellent cuticles
- Larger jug means fewer repeat purchases across multiple seasons of treatment
Things To Consider
- Does nothing on its own; it has to be paired with a real herbicide to be useful
- Slightly thicker than water, so you need to agitate your sprayer tank to keep it mixed
- Shelf life is long but the bottle should be capped tightly to avoid the concentrate drying out
Made For
Homeowners already comfortable mixing their own tank sprayer and who want to squeeze better performance out of any post-emergent herbicide they already own.
Consider Something Else When
If you would rather skip the mixing step entirely, the Roundup Concentrate Plus with Easy Measure Cap is the simpler path for most people.
This is the classic non-selective (kills any plant it touches) weed killer that most people picture when they think about killing crabgrass in sidewalk cracks and driveway edges. The Weed and Grass Killer₄ formulation is built to move through the leaves and down to the root system, so the weed does not just brown on top and then sprout back.
The 64-ounce concentrate pairs with a Sure Shot Wand for targeted spraying around flower beds, trees, walkways, and fence lines. Visible results show up in hours and the spray becomes rainfast in around thirty minutes, which helps if a pop-up shower catches you mid-job.
Well-Handled Touches
- Kills large crabgrass along with dandelions, clover, poison ivy, and spotted spurge to the root
- Replanting window ranges from 1 to 30 days depending on what you want to put back in that spot
- Sure Shot Wand minimizes overspray onto nearby ornamentals when aimed carefully
A Few Limitations
- Non-selective, so accidental drift or splash will damage or kill any turf or plant it lands on
- Concentrate requires measuring and a dedicated tank sprayer for larger areas
- Bottle needs a cool storage spot away from kids and pets, just like any concentrate herbicide
Who It Suits Best
Homeowners targeting crabgrass in non-lawn areas, such as driveways, gravel strips, mulched beds, and walkway edges where total vegetation control is the goal.
Skip It When
Anyone trying to kill crabgrass growing inside a desirable lawn should consider the Ortho WeedClear Ready-to-Spray, which is selective (kills listed weeds without harming the lawn).
Prodiamine is a pre-emergent herbicide, which means it forms a chemical barrier in the top inch of soil that stops crabgrass seeds from germinating in the first place. The Quali-Pro version uses a 65% water-dispersible granule (WDG) formulation in a 5-pound bottle, which is plenty for several mid-sized residential lawns.
It is a flexible product because you can apply it in either spring (before soil temps hit the 55°F threshold that wakes crabgrass seeds) or in fall for winter annual prevention. Many turf managers rotate spring and fall apps to cover both windows.
Advantages To Know
- Granules spread easily with a broadcast spreader for large, even coverage
- Plays nicely with fertilizer blends, so you can combine applications in one pass
- Provides season-long control when timed to soil temperature in your area
Honest Caveats
- Does not touch crabgrass plants that have already emerged; you need a post-emergent partner for active weeds
- Timing is everything, and missing the application window means waiting until next season
- Spreader calibration matters; uneven application can leave striped breakthrough patches
Best Suited To
Homeowners planning ahead who want to prevent crabgrass before it ever sprouts, especially those with warm-season or transitional-zone lawns.
Reach For A Different Pick When
Someone staring down an established crabgrass infestation should grab the Roundup Weed and Grass Killer₄ instead, since pre-emergents cannot help plants already above the soil line.
The Concentrate Plus is the older-school Roundup formula that a lot of long-time homeowners grew up with. It is built for tank sprayer use, comes with an Easy Measure Cap so you do not need a separate measuring cup, and covers a wide list of uses from driveway cracks to mulch beds.
It is rainproof in 30 minutes and works around flowers, shrubs, and trees where you want clean edges without damaging ornamentals, as long as you keep the spray off the foliage. Lawn replacement and garden bed prep are the most common residential use cases.
Key Advantages
- Easy Measure Cap removes one of the most common mixing mistakes
- Covers walkways, driveways, edging, fences, gravel, and large renovation prep areas
- Economical per ounce compared to ready-to-use sprays for bigger properties
Possible Compromises
- Not for use around existing edibles, so vegetable gardeners have to plan around treated zones
- Tank sprayer required, which is another piece of equipment to clean and store
- Non-selective action means careful aim is needed around any plant you want to keep
Whose Shelf It Belongs On
Anyone with a tank sprayer already on hand and a mid-sized lot that needs regular spot treatments along hardscape edges.
A Better Fit Elsewhere
For homeowners fighting crabgrass in an established lawn, the Quali-Pro Prodiamine applied pre-emergence is the more lawn-friendly strategy.
The Ortho WeedClear Ready-to-Use is a selective lawn weed killer, which means it is designed to kill listed weeds like crabgrass, dandelion, clover, chickweed, and creeping charlie without harming your lawn when applied as directed. The Comfort Wand attachment turns the bottle into a battery-powered trigger sprayer, so there is no pumping or mixing.
The 1.33-gallon container covers a respectable lawn area and is shaped for casual one-handed spraying. For someone walking out the door for their first real weed-control project, this is the lowest-friction option in the lineup.
Useful Highlights
- Kills over 200 listed broadleaf and grass weeds including crabgrass, when applied correctly
- No mixing or measuring; the bottle is the sprayer
- Comfort Wand reduces hand fatigue during longer spot-treating sessions
Where It May Fall Short
- Selective action only works against listed weeds, so misidentification is a real risk
- Coverage per bottle is limited compared to concentrates, raising per-treatment cost on larger lawns
- Reapplication is sometimes needed for stubborn crabgrass clumps in mid-summer
Perfect Match For
First-time weed-control users who want a product that opens the box, hooks up, and starts spraying without any chemistry homework.
Swap It Out When
Anyone with several acres or many weeds across a wide lawn will find the Ready-to-Spray hose-end version or a concentrate like Roundup Concentrate Plus more economical.
The Ready-to-Spray version uses a standard garden hose connection to pull concentrate from the bottle and mix it on the fly through the sprayer nozzle. There is no battery, no pumping, and no measuring cup, which makes it a quick grab-and-go option for weekend touch-ups.
The 32-ounce bottle treats a smaller footprint than its Ready-to-Use sibling, but the hose-end format lets you cover ground faster without dragging a heavy filled jug. Visible results typically show within hours and the formula becomes rainproof in about one hour.
What Works In Its Favor
- Hose-end format means no tank to clean and no concentrate to measure
- Targets crabgrass, dandelion, clover, chickweed, and creeping charlie in lawns
- Lightweight bottle makes it easy for any household member to handle
Soft Spots
- Spray accuracy is looser than a wand; overspray onto flower beds is a real risk
- Coverage depends on consistent water pressure, so low-pressure wells may give uneven output
- Smaller bottle means more frequent repurchases on larger lawns
Built With In Mind
Homeowners with smaller lawns and a clean, modern garden hose setup who want to spend less time on the prep and more time spraying.
Where Another Pick Suits Better
Anyone fighting widespread crabgrass across a big lawn will get more mileage out of the Ortho WeedClear Ready-to-Use 1.33 gal. for tank-style coverage.
What Matters Most Before Choosing Crabgrass Killers For Lawns
Selective vs. non-selective chemistry. The single biggest decision is whether you want a selective herbicide (kills listed weeds without harming turf) or a non-selective herbicide (kills anything green it touches). Crabgrass growing inside your lawn demands selective chemistry like the Ortho WeedClear line, while crabgrass in driveway cracks or sidewalk seams is a perfect job for a non-selective product like the Roundup concentrates.
Pre-emergent vs. post-emergent timing. Pre-emergent herbicides like Quali-Pro Prodiamine form a barrier that stops seeds before they sprout. Post-emergent products like MSMA or selective lawn sprays kill plants that have already broken through. The honest read is that the best lawn-care programs layer both, applying pre-emergent in early spring and following with post-emergent spot treatments as needed.
Grass type compatibility. Cool-season grasses (bluegrass, fescue, ryegrass) and warm-season grasses (bermudagrass, zoysia, St. Augustine) tolerate different herbicides. Always confirm the label lists your specific turf type before mixing or spraying, especially with strong active ingredients like MSMA.
Sprayer format and storage. Concentrates save money but require a tank sprayer, mixing space, and PPE (personal protective equipment) storage. Ready-to-use and hose-end products trade some economy for convenience. Match the format to your storage situation and how much mixing you actually want to do.
Key Considerations Across These Picks
Pitfalls Shoppers Hit. The most common mistake is grabbing a non-selective herbicide and spraying crabgrass in the middle of a desirable lawn, which kills the grass along with the weed. Always read the label for the “lawn-safe” or “selective” designation before you start. Another trap is treating crabgrass with a pre-emergent after the plants have already emerged, then wondering why nothing happens. Pre-emergents only stop seeds, not established plants.
Where The Extra Money Goes. Premium-tier crabgrass products typically invest in surfactant packages, faster rainfast times, and broader weed spectrums without harming more turf varieties. The upgrade is worth it for homeowners managing larger lawns where missed spots show up clearly, and for anyone who values finishing the job in one pass rather than three.
Frequently Asked Questions
What is the best time of year to kill crabgrass? Pre-emergent herbicides work best in early spring before soil temperatures reach about 55°F. Post-emergent sprays are most effective on young crabgrass plants in late spring or early summer.
Can I spray crabgrass killer on a newly seeded lawn? Most selective herbicides need the new grass to be established for at least one full mowing cycle. Newly seeded lawns are typically too tender for crabgrass sprays until they mature.
How long does it take crabgrass killer to work? Visible browning usually appears within hours for non-selective products. Selective post-emergents can take several days to a couple of weeks for full root kill on stubborn crabgrass.
Is MSMA safe for residential lawns? MSMA is restricted in many states for residential turf use because of its arsenic content. Always check current state regulations and never use it without reading the full label and wearing proper PPE.
Can I prevent crabgrass without chemicals? Yes. A thick, properly mowed, well-fertilized lawn naturally crowds out crabgrass. Pre-emergent herbicides simply add insurance during the seed-germination window each spring.