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.
Crabgrass is the uninvited guest that shows up every summer and refuses to leave. You want it gone — fast — without torching the rest of your lawn. The problem is most sprays either fizzle out on mature plants or take so long you forget where you sprayed. This guide cuts through the product labels to show you which formulations actually deliver, which ones are worth the premium, and which budget options leave you disappointed.
I’m Rikta — the founder and writer behind Lawn Gear Lab. 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.
if you need a ready-to-use wand for spot-treating a few clumps or a concentrated jug to cover the whole yard, this look at the best spray for crabgrass compares seven options head-to-head by active ingredient, coverage area, and real-world buyer results.
Quick Picks
- Select Source Triad QC Select – 3-Way Herbicide with Quinclorac — Best Overall
- Quali-Pro Quinclorac 1.5 L – (1/2 gal.) Compare to Drive XLR8 — Best Concentrate Value
- Primesource Quinclorac 1.5L Select – Liquid Crabgrass Killer — Best Premium Concentrate
- GORDON’S Trimec Plus Crabgrass Killer Concentrate, 1 Quart — Best Budget Concentrate
- Roundup for Lawns Crabgrass Destroyer2, Ready-to-Use, 64 oz — Ready-to-Use Spot Spray
- Fertilome (11032) Weed-Out with Crabgrass Killer (32 oz) — Budget-Friendly Concentrate
- Ortho Weed B Gon Plus Crabgrass Control Ready-To-Use Comfort Wand, 1 gallon — Large-Area Ready-to-Use
How To Choose The Best Spray For Crabgrass
Not all weed killers are built for crabgrass. A general broadleaf spray (a product that targets wide-leaf weeds like dandelions) will leave those grassy clumps standing tall. You need a selective post-emergent herbicide (a product that kills specific weeds after they have sprouted) with active ingredients proven to knock down crabgrass. Here is what to check.
Start with the active ingredient
Quinclorac is the heavy hitter for crabgrass. It is absorbed by both the leaves and the roots, so it works on plants that have already grown past the tiny sprout stage. Topramezone (found in the Roundup for Lawns product) is another option that targets grassy weeds but is gentler on certain cool-season turfgrasses like fescue and bluegrass. A 3-way blend — like 2,4-D, Dicamba, and Quinclorac together — broadens the kill list to include both grassy and broadleaf weeds in one pass.
Choose your format: Concentrate vs. Ready-to-Use
A concentrate (like a quart bottle you mix with water in a pump sprayer) gives you far more coverage per dollar and lets you dial in the strength. A ready-to-use (RTU) bottle or wand is convenient for small patches — you pull the trigger and walk — but you pay a premium for that convenience and often get a weaker sprayer. If you have more than a few hundred square feet of crabgrass, a concentrate is usually the smarter buy.
Match the spray to your grass type
Some products are safe on cool-season grasses (Kentucky bluegrass, fescue, ryegrass) but can temporarily yellow Bermudagrass or St. Augustine. Always check the label for your specific turf type. The best pick for a Bermuda lawn is a Quinclorac-based spray, which buyers consistently report works safely on warm-season grasses.
Check coverage and price per square foot
A quart of concentrate might claim 5,000 square feet of coverage, while a ready-to-use gallon wand covers less ground because the product is already diluted. Compare the total square footage you can treat, not just the bottle size. If you are covering an entire lawn, a concentrate that treats 5,000 square feet will go much further than a ready-to-use that covers a fraction of that.
Quick Comparison
On smaller screens, swipe sideways to see the full table.
| Model | Best For | Active Ingredient | Liquid Volume | Coverage | Amazon |
|---|---|---|---|---|---|
| Select Source Triad QC Select | Best Overall | 2,4-D, Dicamba, Quinclorac | 32 oz | Various turf sites | Amazon |
| Quali-Pro Quinclorac 1.5 L | Best Concentrate Value | 17.79% Quinclorac | 1/2 gal | 1,500 sq ft | Amazon |
| Primesource Quinclorac 1.5L | Best Premium Concentrate | 18.92% Quinclorac | 64 oz | 500 sq ft | Amazon |
| GORDON’S Trimec Plus | Best Budget Concentrate | 3-way herbicide | 32 oz | 5,000 sq ft | Amazon |
| Roundup for Lawns Crabgrass Destroyer2 | Ready-to-Use Spot Spray | Topramezone | 64 oz | Grassy weeds | Amazon |
| Fertilome Weed-Out with Crabgrass Killer | Budget-Friendly Concentrate | — | 32 oz | 5,000 sq ft | Amazon |
| Ortho Weed B Gon Plus Crabgrass Control | Large-Area Ready-to-Use | — | 140.8 oz | 1.1 gallons | Amazon |
In‑Depth Reviews
1. Select Source Triad QC Select – 3-Way Herbicide with Quinclorac
The three-ingredient powerhouse that tackles crabgrass and broadleaf weeds in one pass.
This 32-ounce concentrate combines 2,4-D, Dicamba, and Quinclorac — three active ingredients that work together so you do not have to buy a separate spray for dandelions and clover. The Quinclorac handles crabgrass at multiple growth stages, from newly germinated 1- to 2-leaf plants all the way up to mature plants with 5 tillers or more. That breadth matters because crabgrass rarely shows up in a single uniform stage.
Buyers report that it is “the only product that kills crabgrass safely in Bermuda” — a big deal if you manage a warm-season lawn where many herbicides cause temporary yellowing. Owners also note that it works on tough targets like Dallisgrass, with purple tips appearing in about a week and full death in two. The trade-off is patience: owners mention it “takes a long time to take effect and then all of a sudden the crab grass dies,” so do not expect overnight results. It also requires a surfactant (a wetting agent you add to the tank) and a spray dye so you can see where you have already sprayed — two extra purchases you need to budget for.
Unlike the Ortho Weed B Gon wand, which customers note was “useless” against crabgrass, this Triad blend earns consistent praise for actually delivering on its claims. It is approved for residential lawns, athletic fields, roadsides, parks, and golf turf (except greens, tees, and collars), so it pulls duty beyond just your backyard.
Powerful but patient: The 3-in-1 formula is ideal for homeowners who want to clean up crabgrass plus broadleaf weeds at the same time, but you will need a surfactant and a few weeks of patience to see full results.
Reach for this if: You have a mixed weed problem (crabgrass + dandelions + clover) and want one concentrate that covers them all, especially on a Bermuda or fescue lawn.
The one caveat: You must buy surfactant and spray dye separately, and results take weeks — not days — to appear.
2. Quali-Pro Quinclorac 1.5 L – (1/2 gal.) Compare to Drive XLR8
The half-gallon jug that brings professional-grade Quinclorac to your backyard.
This is a straight Quinclorac concentrate at 17.79% — the same active ingredient used in commercial products like Drive XLR8, minus the brand markup. It targets large and smooth crabgrass, foxtail (giant, green, and yellow), kikuyugrass, signalgrass, torpedograss, and a long list of broadleaf weeds including dandelion, clover, and dollarweed. One reviewer summed it up simply: “Destroys crabgrass.” Bayer pattern: “Visible results in ~4 days; crabgrass withers/dries out.”
Where this pick truly separates itself from the GORDON’s Trimec below is the faster visual feedback. Reviewers report “results in 2-3 days” when mixed at 1 oz per gallon with a surfactant like MSO (methylated seed oil — a plant-based wetting agent that helps the herbicide stick to waxy weed leaves). The coverage area is listed at 1,500 square feet, which is notably smaller than the GORDON’s 5,000-square-foot claim, but the formula is more concentrated and potent specifically for crabgrass. One long-time buyer says it “dramatically reduced dandelions from tens of thousands to ~20 over 3 years” and “eliminated July crabgrass explosion within 2 weeks.”
A fair word: one reviewer found the kill rate “maybe 80%” compared to the now-banned MSMA, and you will need to reapply on stubborn patches. The half-gallon size means you mix only what you need — it stores well if you close it tight.
The Upside
- Fast visual results — buyers see withering in 2-4 days
- Kills a huge range of grassy and broadleaf weeds in one mix
- Safe on most turfgrasses when used with surfactant
The Trade-Offs
- Covers only 1,500 sq ft — less than GORDON’s Trimec
- Requires MSO surfactant for best results (sold separately)
- Some users report ~80% kill rate needing a second pass
A fast-acting heavy hitter: Ideal if you want the pure Quinclorac punch and do not mind mixing your own tank — expect to see crabgrass withering within a few days.
skip it if: You want one product that does both grassy and broadleaf weeds with no extra additive; you will need surfactant separately.
3. Primesource Quinclorac 1.5L Select – Liquid Crabgrass Killer
The highest-concentration Quinclorac spray that nukes crabgrass in under a week.
At 18.92% Quinclorac, this is the strongest straight Quinclorac concentrate in this lineup — a hair above the Quali-Pro’s 17.79%. That small difference matters for heavy infestations. Reviewers point out mixing 4 oz per 2 gallons of water with a few drops of dish soap (Dawn is a common home-surfactant hack) and seeing crabgrass “dying in 3 days, dead in a week.” One reviewer’s lawn was so clean after a single application that they said “war on crabgrass, I won!”
The formula is also broader than the Quali-Pro’s: it lists the same long roster of grassy and broadleaf weeds (crabgrass, foxtail, kikuyugrass, torpedograss, dandelion, clover, morningglory, and more) plus specific activity on bindweed, english daisy, and speedwell. The coverage is only 500 square feet per label, which is the smallest in this list — but that number is conservative because Quinclorac-based products can be spot-sprayed at higher concentrations rather than broadcast over the entire lawn. One buyer treated 1/2 acre and killed about 70% of their crabgrass after a follow-up spot spray.
The main knock is the value per square foot: at 500 square feet of labeled coverage, this is the most expensive product per foot compared to the GORDON’s Trimec, which claims 5,000 square feet. For a small lawn or targeted patch treatment, the strength is worth the extra cost. For a full-yard broadcast, you would need multiple bottles.
Highest strength, small coverage: Perfect for homeowners who want the most potent Quinclorac available and are spot-treating patches — not for covering a whole acre in one go.
Best for: Targeted attack on established crabgrass clumps in a small to mid-sized yard where you want maximum kill power per spray.
Look elsewhere if: You need to blanket a large lawn — the 500 sq ft rating means you will go through bottles fast.
4. GORDON’S Trimec Plus Crabgrass Killer Concentrate, 1 Quart
The concentrate that covers 5,000 square feet and shows results in two days.
GORDON’S Trimec Plus is a 3-way herbicide blend in a 32-ounce quart that covers the same 5,000 square feet as the Fertilome product but weighs just 16 ounces — the bottle itself is lighter than the Fertilome at 2 pounds. Shoppers say “visible results in 2 days, full control in 7 days,” which is on the faster end for a non-quinclorac formulation. It controls 200+ broadleaf weeds like dandelions and plantain in addition to grassy weeds like crabgrass, foxtail, and signalgrass.
Where this one pulls ahead of the Fertilome (which has one verified review stating it “did not work on crab grass at all”) is consistency: GORDON’S buyers consistently report effective control, especially on Bermuda grass. One reviewer cleared a serious crabgrass infestation after a monsoon flood dumped seeds across their lawn. The catch is the coverage — 5,000 square feet is generous for a quart, and it weighs just 16 ounces (a 5.2x weight gap compared to the Ortho Weed B Gon wand at 10.4 pounds). That makes it easy to handle.
The one asterisk: you are mixing your own spray, so you will need a separate pump sprayer. And the product kills actively growing weeds but not the seeds, so a follow-up pre-emergent in spring is still smart.
What Works
- Fast visual feedback — buyers report results in 2 days
- Covers 5,000 sq ft, the most of any concentrate here
- Safe on Bermuda grass and Zoysia, per verified reviews
The Catch
- Does not kill crabgrass seeds — needs pre-emergent follow-up
- Requires a separate pump sprayer
- May need 2-3 applications for heavy infestations
The smart value pick: Grab this if you have a large lawn (up to 5,000 sq ft) and want a budget-friendly concentrate that works fast in Bermuda or fescue.
The honest limitation: Not the best choice for spot-treating a few isolated clumps — the 32 oz makes more than you need for small patches.
5. Roundup for Lawns Crabgrass Destroyer2, Ready-to-Use, 64 oz
The trigger-sprayer bottle for quick hits on visible crabgrass clumps.
This 64-ounce ready-to-use bottle uses Topramezone as its active ingredient — a different chemistry from Quinclorac that is designed to kill grassy weeds to the root while being safe on cool-season turf like Kentucky bluegrass, fine fescue, perennial ryegrass, and tall fescue. You pull the trigger and spot-spray directly, no mixing, no pump sprayer. Owners mention it is “effective on mature crabgrass” and that crabgrass “turns white in a week.”
The trade-off is the sprayer itself. Multiple reviews note the nozzle “didn’t spray well” — the product came out as a stream rather than a fine mist — and some recent bottles arrived missing the sprayer altogether. For large areas, one verified buyer managing an acre of fescue/bluegrass called it “tedious with hand sprayer” and wished a concentrate version existed. The 64 fluid ounces are ready to use, meaning you cannot dilute it to stretch further.
Compared to the Ortho Weed B Gon wand below, this Roundup product has a much better track record in reviews.
Perfect for small patches: Ideal for the homeowner who spots a few crabgrass clumps and wants to hit them without mixing — just spray and go.
Not for big lawns: The weak sprayer and limited coverage make it a poor fit for tackling a yard-wide crabgrass problem.
6. Fertilome (11032) Weed-Out with Crabgrass Killer (32 oz)
A low-price concentrate that covers 5,000 square feet — if it works on your weeds.
Fertilome Weed-Out is a 32-ounce selective weed killer concentrate that claims to control over 200 grassy and broadleaf weeds including crabgrass and foxtail. It treats up to 5,000 square feet, matching the GORDON’s on coverage. It is labeled for use on established lawns including Bermuda, Buffalo, and Kentucky Bluegrass, though the manufacturer warns that applying to Bermudagrass may cause temporary yellowing or discoloration (full recovery is expected). At just 2 pounds, it is the second-lightest concentrate bottle after GORDON’s.
Here is where the story gets mixed. While several buyers call it “a very effective product at a good price” and say “it works. Nothing else needs to be said,” one verified review bluntly states: “Did not work on crab grass at all.” That is a red flag you do not see with the Quinclorac-based products above. Another buyer noted it “will get rid of the ground ivy” — so it may be better as a broadleaf killer than a dedicated crabgrass solution.
Unlike the GORDON’s Trimec, which has consistent reports of crabgrass kill, this Fertilome product divides opinion. If you have a light crabgrass problem and a tight budget, it is worth a try. If crabgrass is your main enemy, spend the extra few dollars on GORDON’s or go straight to Quinclorac.
Mixed results on crabgrass: A cheap concentrate that works for some buyers but has a verified report of total failure on crabgrass — roll the dice accordingly.
Best for: Very light crabgrass pressure in a mixed-weed lawn where you also need broadleaf control.
pass on it if: You have a serious crabgrass infestation — the risk of wasted time and money is real.
7. Ortho Weed B Gon Plus Crabgrass Control Ready-To-Use Comfort Wand, 1 gallon
The powered wand that covers a lot of ground — if the formula works for you.
At 140.8 fluid ounces (just over a gallon), this is the largest single bottle of ready-to-use spray in the lineup. It weighs 10.4 pounds — a 5.2x weight gap compared to the GORDON’s Trimec concentrate at 16 ounces — so you feel it as you walk. The Comfort Wand has a battery-powered spray nozzle that saves you from pumping, which buyers like: “set spray pattern, aim, shoot. No pumping.” It kills 200+ weeds including crabgrass and dandelions, and the maker says it starts working immediately.
The problem is the same story repeated in multiple reviews: “Useless; no effect on weeds or crabgrass after two sprays.” A second reviewer called it a “complete waste of time and money.” Even buyers who found it effective on other weeds noted it was “ineffective on Creeping Charlie.” The Ortho wand holds a 4.4x gap in liquid volume over the GORDON’s concentrate (140.8 oz vs 32 oz), but most of that volume is water — you get convenience, not potency.
Compared to the Roundup for Lawns spray, which shows better consistency on crabgrass in reviews, the Ortho wand is a gamble. If you decide to try it, use it on a calm, windless day — overspray can damage desirable plants, and the wand is short, which means you will be stooping the whole time.
High convenience, low reliability: The powered wand is easy to use, but buyer reports on crabgrass control are split — many say it simply does not work.
Only consider this if: You already use Ortho products for other weeds and want the convenience of a battery wand for tiny lawns with very light crabgrass.
Hard pass if: Crabgrass is your main target — the risk of failure is too high based on real buyer experiences.
Understanding the Specs
Quinclorac Concentration
A higher percentage of Quinclorac (like 18.92% in the Primesource vs 17.79% in the Quali-Pro) means you need less product in your tank to hit the same kill rate. For heavy infestations of mature crabgrass, a higher concentration translates to faster, more reliable die-off. For light maintenance, a lower concentration works fine and stretches your dollar further.
Coverage Area
Listed coverage (like 5,000 square feet vs 500 square feet) tells you how much lawn one bottle treats when mixed to the label rate. A product claiming 5,000 square feet is typically cheaper per square foot than one claiming 500 square feet — but the smaller-coverage product usually has a higher active-ingredient concentration, so you spot-spray less volume. Match the coverage to your lawn size.
FAQ
What is the best active ingredient for killing crabgrass?
Can I use a crabgrass spray on my Bermuda grass lawn?
How long does it take for crabgrass spray to show results?
What is a surfactant and do I need one?
Can I spray crabgrass killer before mowing?
Will crabgrass killer harm my lawn grass?
Is a concentrate or ready-to-use spray better for crabgrass?
Can I kill crabgrass after it has gone to seed?
Final Thoughts: The Verdict
For the majority of shoppers, the spray for crabgrass winner is the Select Source Triad QC Select because it combines three proven active ingredients (2,4-D, Dicamba, and Quinclorac) to handle crabgrass at any growth stage while also cleaning up broadleaf weeds. If you want the fastest visible results on pure crabgrass, grab the Quali-Pro Quinclorac 1.5 L — reviewers point out withering in days. And for the tightest budget on a concentrate that covers the whole lawn, the GORDON’S Trimec Plus gives you 5,000 square feet for a moderate outlay.
How We Picked
We do not accept paid placement, and we did not hands-on test every unit. Instead, we match each pick to a real buyer and use-case by comparing the manufacturers’ published specifications against the patterns in verified customer reviews — so you get each pick’s real strengths and trade-offs instead of marketing copy.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of July 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
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