Our readers keep the lights on and the coffee maker working hard! As an Amazon Associate, I earn from qualifying purchases.
Specs are compiled from manufacturer listings and verified buyer reviews and can change over time — please confirm the key details on the product page before buying.
That ugly, fast-spreading crabgrass in your fescue or Bermuda lawn isn’t just an eyesore—it’s a weed that chokes out the grass you actually want. The right crabgrass killer spray targets the weed while sparing your lawn grass, and this guide breaks down the sprays that deliver on that promise. You’ll learn which active ingredient matters most, how much coverage you really need, and where the trade-offs hide.
I’m Mohammad Maruf — the founder and writer behind Gardening Beyond. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
Whether you’re spot-treating a handful of weeds or plan to cover the whole yard, this rundown of the best crabgrass killer spray options sorts the fast-acting formulas from the slow-and-steady ones that need more patience.
Our Picks at a Glance
How To Choose The Best Crabgrass Killer Spray
To kill crabgrass without harming your lawn, you need to match the spray to your yard’s size and the weed’s growth stage. The active ingredient (the chemical that does the killing) and whether you use a ready-to-spray bottle or a concentrate you mix yourself determine how easy and effective the job will be. Get these right, and you avoid a summer of re-spraying.
Active Ingredient: Quinclorac is the Star
The single most important factor is the active ingredient. Quinclorac is the proven post-emergent compound for killing crabgrass that has already sprouted. Several of the strongest options here, like the Primesource and Liquid Harvest bottles, use it at an 18.92% concentration.
Ready-to-Use vs. Concentrate
Ready-to-use sprays come pre-mixed in a bottle, often with a wand, so you just point and spray—super convenient for spot-treating a few weeds. Concentrates require you to mix the liquid with water in a sprayer, which takes a little more effort but usually covers far more ground for your money and gives you control over the mixture strength.
Weed Growth Stage Matters
Most of these sprays work best on crabgrass that is young and actively growing, usually in spring or early summer. Mature crabgrass that has already gone to seed is much harder to kill, which is why you’ll see advice about applying pre-emergent treatments later to stop the next generation.
Quick Comparison
| Model | Best For | Active Ingredient | Coverage | Bottle Size | Amazon |
|---|---|---|---|---|---|
| Primesource Quinclorac 1.5L★ Best Overall | Serious, fast crabgrass control | Quinclorac 18.92% | 500 sq ft | 64 fl oz | Amazon |
| Ortho WeedClear 1.33 galBest Value | Easy spot-treating with a wand | Lawn weed killer blend | N/A | 170.24 fl oz | Amazon |
| GORDON’S Trimec PlusBudget Champion | Whole-yard coverage on a budget | 3-way herbicide blend | 5,000 sq ft | 32 fl oz | Amazon |
| Fertilome Weed-Out | Broad grassy and broadleaf weed control | Selective weed killer | Up to 5,000 sq ft | 32 oz | Amazon |
| Image Crabgrass & Nutsedge Killer | Killing crabgrass plus tough nutsedge | Lawn weed killer blend | 6,000 sq ft | 24 fl oz | Amazon |
| Primesource Quinclorac 7.5 oz | High-concentration small-area control | Quinclorac 18.92% | 1,000 sq ft | 7.5 fl oz | Amazon |
| Ortho Weed B Gon Plus | Killing 200+ weeds with a wand | Lawn weed killer blend | Treatment for 1.1 gal | 140.8 fl oz | Amazon |
| Liquid Harvest Pro Quinclorac | Professional-grade residual control | Quinclorac 18.92% | Residual Control | 32 fl oz | Amazon |
In‑Depth Reviews
1. Primesource Quinclorac 1.5L Select Liquid Crabgrass Killer
Our pick — over 4★ from 700+ verified ratings; the strongest balance of quality and price.
The fast-acting Quinclorac concentrate that pros reach for when crabgrass has already taken hold.
The active ingredient here is Quinclorac at an 18.92% concentration, the proven chemistry for killing crabgrass that’s already sprouted. This is a concentrated liquid you mix yourself, and the payoff is speed—buyers report seeing crabgrass die by day 4, with the lawn grass left completely untouched. That selectivity is key: you want the weed gone, not your fescue.
It also controls foxtail, kikuyugrass, torpedograss, and broadleaf weeds like dandelion and clover. The catch is that results depend heavily on mixing in a quality surfactant (a soap-like additive that helps the spray cling to leaves instead of beading off). Reviewers are blunt that skimping on it reduces results, and they recommend following the label’s mixing instructions carefully to get the full kill.
For the money, this is the one that owners mention outperforms other brands they’ve tried, especially on mature crabgrass that other sprays struggle with. The 64-ounce bottle covers 500 square feet, which is a modest area, so think of it as a targeted weapon for the worst patches of your lawn rather than a whole-yard drench.
What Wins People Over
- Kills crabgrass fast, with visible die-off in days
- Selective formula spares your lawn grass when used as directed
- Blue dye in the mix shows where you’ve sprayed
What to Know Before You Buy
- A surfactant (mixing additive) is basically required for best results
- Coverage is limited to 500 sq ft per bottle
- Mix-it-yourself format means reading the label carefully
Reach for this if: you have established crabgrass patches and want the most effective kill per spray.
Look elsewhere if: you want a grab-and-go bottle with no mixing required.
2. Ortho WeedClear Lawn Weed Killer Ready-to-Use with Comfort Wand, 1.33 gal
A grab-and-go wand sprayer that makes weekly spot-treating almost easy, if you’ve got patience.
This is the no-mixing, no-fuss option: a 1.33-gallon jug with a battery-powered Comfort Wand that sprays on its own, so you’re not squeezing a trigger with your thumb the whole time. It’s built for spot-treating weeds on common lawn grasses like fescue, Kentucky Bluegrass, and Zoysiagrass, targeting crabgrass, dandelion, clover, and chickweed down to the root with one application.
The honest trade-off is speed. Buyers consistently describe it as “slow but effective,” with one noting it kills weeds in about a month without harming the grass. The experience is characterized as requiring patience—weeds wilt gradually rather than vanishing overnight, and tougher invasive species may need a second spray. The wand earns steady praise for being easy and intuitive, with a consistent spray pattern and minimal overspray.
It holds far more liquid than the competing 1-gallon Ortho bottle—170.24 fluid ounces versus 128—so you get more treatments per purchase. If you have a steady rotation of young weeds popping up through spring and fall, this becomes a practical weekly tool rather than a one-time fix.
Why It’s Convenient
- Battery-powered wand means no trigger-squeezing
- Ready-to-use, zero mixing required
- Large 170.24 fl oz bottle lasts through many treatments
The Patience Factor
- Results take about a month, not days
- Invasive weeds often need multiple sprays
- An occasional batch has arrived with quality issues, per a few owners
Best for: the gardener who wants a simple, ready-to-use wand for weekly spot-treating of young weeds.
Think twice if: you need immediate, dramatic results on mature crabgrass.
3. GORDON’S Trimec Plus Crabgrass Killer Concentrate, 1 Quart
A concentrated formula that covers 5,000 square feet—ten times the ground of our top pick for similar money.
The value story here is impossible to ignore: this 32-ounce quart concentrates into coverage of 5,000 square feet, while the top-pick Primesource bottle covers just 500 square feet at a higher price. That’s a massive gap for homeowners treating a full lawn rather than a patch. It’s a concentrated formulation built around a 3-way herbicide blend designed to control emerged grassy weeds like crabgrass, foxtail, and signalgrass, plus 200+ common broadleaf weeds.
Reviewers point out visible results in about 2 days and confirmed control by day 7. One owner shared a telling story: a monsoon flood deposited tons of crabgrass seeds across their Bermuda lawn, and this product cleared up the serious infestation that followed. It kills the growing weeds, though as one reviewer notes, it doesn’t kill the seeds—so expect regrowth from seeds already in the soil.
The main caveat is patience and persistence. Reviews indicate it often takes 2-3 applications, with a repeat treatment 7-10 days after the first for best results. If you have a large yard with widespread crabgrass, this is the most economical path to treating the whole thing at once.
The Big Win
- Covers 5,000 sq ft—ten times more ground than the top pick
- Controls grassy weeds plus 200+ broadleaf weeds
- Visible results in about 2 days
The Fine Print
- Often needs 2-3 applications for full control
- Kills growing weeds but not the seeds
- Mix-it-yourself concentrate requires a sprayer
Reach for this if: you’re treating a large lawn with widespread crabgrass and want maximum coverage per dollar.
Look elsewhere if: you only have a few weeds and don’t want to mix your own spray.
4. Fertilome Weed-Out with Crabgrass Killer Concentrate, 32 oz
A selective concentrate that controls over 200 weeds across established lawns, with a warning about Bermuda.
This 32-ounce concentrate is built for established lawns including Bermuda, Buffalo, and Kentucky Bluegrass, controlling over 200 grassy and broadleaf weeds including crabgrass and foxtail. A single bottle can treat up to 5,000 square feet, putting it in the same whole-yard coverage class as the GORDON’S pick but with a different active formulation. It’s positioned as the option for lawns with a mix of weed problems, not just crabgrass alone.
Reviews here are genuinely split—some owners call it a very effective product at a good price, while others say it didn’t touch their crabgrass at all. That divergence suggests results depend heavily on weed type, growth stage, and following the instructions to the letter. One practical note from a satisfied buyer: retreat a few days later to make sure stubborn weeds are fully killed.
The label carries an important warning for Bermuda grass owners: applying to bermudagrass may cause temporary yellowing or discoloration, though full recovery is expected. If you have a Bermuda lawn and can’t tolerate even a temporary color change, this is a factor to weigh before buying.
What It Offers
- Controls 200+ grassy and broadleaf weeds
- Treats up to 5,000 sq ft per bottle
- Safe for established lawns like Bermuda and Buffalo grass
The Risk
- Effectiveness feedback is genuinely mixed
- May cause temporary yellowing on Bermuda grass
- Some owners found the price high for results
Best for: lawns with a broad mix of grassy and broadleaf weeds needing one product.
Think twice if: you have a Bermuda lawn sensitive to color change or want guaranteed crabgrass-only results.
5. Image Herbicide Crabgrass, Nutsedge, & Weed Killer for Lawns, 24 fl oz
The rare all-in-one that takes on crabgrass AND the notoriously tough nutsedge, killing both to the root.
Most crabgrass sprays stop at grassy weeds, but this one goes further. It’s formulated to kill crabgrass, yellow and purple nutsedge, dandelion, clover, and 100+ other listed weeds, working on contact and killing down to the root. For anyone fighting nutsedge—that stubborn, grass-like weed that resists most standard herbicides—this multi-target approach is a genuine advantage, letting you replace multiple products with one bottle.
The 24-fluid-ounce bottle covers 6,000 square feet, the widest coverage of any concentrate in this lineup. Owners describe it as the only product that killed their invasive wild violets and clover, and one enthusiastic review sums up the feeling: “Die crabgrass! Die nutsedge!” It’s a crowd-pleaser for mixed-weed lawns.
Honest caveats exist. Crabgrass and torpedograss may need multiple treatments, and it doesn’t kill Bermuda grass. There’s also a note from owners that the bottle looks like it holds 32 ounces but actually holds 24, so read the label before you assume. One owner flagged it’s gotten harder to find, possibly due to ingredient restrictions in some states.
The Multi-Target Edge
- Kills crabgrass plus tough nutsedge and wild violets
- Covers 6,000 sq ft—the most in this lineup
- Works on contact down to the root
Know Before Spraying
- Multiple treatments needed for crabgrass and torpedograss
- Does not kill Bermuda grass
- Bottle size can be misleading at a glance
Pick this if: your lawn battles crabgrass plus nutsedge or wild violets that other sprays can’t touch.
pass on it if: you need a product that handles Bermuda grass or want maximum coverage with minimal effort.
6. Primesource Quinclorac 1.5 Select Liquid Crabgrass Killer, 7.5 oz
The small-bottle professional formula that buyers call the best crabgrass killer they’ve used.
Don’t let the 7.5-ounce size fool you—this concentrated Quinclorac at 18.92% is a heavy hitter. It’s rated for use on residential and non-residential turfgrass, golf courses, and sod farms, and it provides up to 90 days of control. Owners describe it as “definitely the best crab grass killer that I have used” and praise it for working on established crabgrass and even dallisgrass, a tough perennial that resists many products.
The coverage math is important here: this tiny bottle covers 1,000 square feet, which is actually double the coverage of the big 64-ounce Primesource bottle. That makes it a budget-savvy choice for small lawns or targeted patch work, despite the higher sticker price. Mix it with a surfactant for best results, as recommended by experienced users.
There’s a real caution for Bermuda owners: one buyer applied it in mid-September and found it severely set back their Bermuda lawn, though they suspected the cool, dry weather slowed recovery. The advice is to apply earlier in the season and consider mixing it weaker than recommended if you’re protecting a warm-season grass.
Why It Impresses
- Works on established crabgrass and tough dallisgrass
- Covers 1,000 sq ft—double the big Primesource bottle
- Up to 90 days of control
Handle With Care
- Hard on grass if applied late in the season
- Max 2 treatments per year to avoid weed resistance
- Small bottle means precise mixing is critical
Reach for this if: you want professional-grade Quinclorac power for a small lawn or stubborn grass weeds.
Look elsewhere if: you have a large yard to cover or a Bermuda lawn where you can’t risk setback.
7. Ortho Weed B Gon Plus Crabgrass Control Ready-To-Use Comfort Wand, 1 gallon
A 1.1-gallon ready-to-use wand sprayer that kills 200+ weeds to the roots with zero mixing.
The appeal here is pure convenience: a 140.8-fluid-ounce jug with a battery-powered Comfort Wand, ready to spray the moment you pick it up. It kills crabgrass, dandelions, and 200+ other common lawn weeds down to the roots, and it starts working immediately. The wand design gets consistent praise—buyers love the adjustable spray tip and the fact that there’s no pumping or squeezing involved. It’s the closest thing to weed control without the workout.
Speed is where the mixed feedback comes in. Some owners describe weeds melting away, while others say the die-off is slow. There’s also a recurring note that the wand is a bit short, which means bending over to treat low weeds. And a few owners have had issues with the spray mechanism itself not working properly, so it’s worth testing the wand right after purchase.
A practical tip from owners: spray on a calm, windless day to avoid overspray drifting onto plants you want to keep. The formula won’t harm your lawn when used as directed, and it’s positioned as a full-yard cleanup tool rather than a precise spot-treating weapon.
The Convenience Win
- Ready-to-use with battery-powered Comfort Wand
- Kills 200+ weeds including crabgrass and dandelions
- Adjustable spray tip for targeted application
The Trade-Offs
- Speed of results varies from fast to slow
- Wand is short, requiring bending
- A few owners had spray-mechanism issues
Best for: homeowners who want a grab-and-go wand for full-yard weed cleanup without mixing.
Think twice if: you want the fastest possible kill or have back problems from bending.
8. Liquid Harvest Pro Crabgrass & Grassy Weed Killer, 32 oz
A professional-grade Quinclorac concentrate with residual control that keeps weeds from coming back.
Priced at the premium end, this 32-ounce concentrate matches the top pick’s 18.92% Quinclorac concentration but adds a selling point the others don’t emphasize: residual control that prevents weeds from reappearing for an extended period. It also claims quick drying, so you’re not waiting around after spraying. The formula targets a wide range of grassy weeds including crabgrass, foxtail, barnyardgrass, and dallisgrass, plus a long list of broadleaf weeds.
Shoppers say visible results quickly—discoloration the next day and yellow/brown weeds by day 4—when they follow the instructions precisely. The key variables owners stress: correct mixing, proper temperature, no rain after application, and using a surfactant. One thorough reviewer followed every instruction and reported spot and broadcast treatments both killed crabgrass while leaving fescue and bluegrass untouched.
The honest reality is that multiple reapplications are common. Even enthusiastic buyers report it needed weekly reapplication, and one reviewer with heavy established crabgrass in Bermuda said results were “just ok” compared to two other products they’d tried. It’s a capable professional-grade tool, but it rewards careful reading of the label and realistic expectations about repeat treatments.
The Pro Edge
- Residual control keeps weeds from reappearing
- Quick drying after application
- Targets crabgrass, foxtail, dallisgrass, and more
What It Demands
- Multiple reapplications common for heavy infestations
- Surfactant and precise mixing essential
- Premium price for the bottle size
Pick this if: you want professional-grade residual control and are willing to follow instructions carefully.
it’s not for you if: you want a set-and-forget spray or are on a tight budget for a small patch of weeds.
Understanding the Specs
Quinclorac Concentration
This is the gold-standard active ingredient for killing established crabgrass. Products here range up to an 18.92% concentration, which is the professional-grade level. Higher concentration means more killing power per ounce, but it also means you must mix and apply it precisely to avoid harming your lawn grass.
Surfactant
A surfactant is a mixing additive that helps the spray cling to weed leaves instead of beading up and rolling off. Without it, rain or even morning dew can wash the herbicide away before it does its job. Most Quinclorac-based products work dramatically better with a quality surfactant mixed in, and several reviewers stress this as the difference between success and failure.
FAQ
What is the best active ingredient for killing crabgrass?
How long does it take for crabgrass killer spray to work?
Will crabgrass killer spray hurt my regular lawn grass?
What is the difference between ready-to-use and concentrate crabgrass killers?
When is the best time to apply crabgrass killer spray?
Why do I need a surfactant with Quinclorac products?
How much area does a bottle of crabgrass killer cover?
Will crabgrass killer spray kill crabgrass seeds?
Can I overseed after using crabgrass killer spray?
Final Thoughts: The Verdict
If you want one dependable pick, the best crabgrass killer spray is the Primesource Quinclorac 1.5L because it delivers the fastest, most reliable kill on established crabgrass with the proven 18.92% Quinclorac chemistry. If you want grab-and-go convenience with a wand, the Ortho WeedClear 1.33 gal is your pick. And for whole-yard coverage on a budget, the GORDON’S Trimec Plus stretches 5,000 square feet per quart—a value that’s hard to ignore.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of August 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
As an Amazon Associate, Gardening Beyond earns from qualifying purchases. This does not affect which products we feature.