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.
You do not want to nuke your whole flower bed just to get rid of the Bermuda grass sneaking through. A selective spray kills the bad grass (crabgrass, Bermuda, tall fescue) without harming your shrubs, flowers, or desired lawn — but only if you pick the right one. This guide compares six herbicides that actually deliver on that promise, from a professional-grade Syngenta concentrate that targets Bermuda in Zoysia to budget-friendly Ortho sprays for spot treatments, so you know exactly what works for your yard.
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.
Syngenta Fusilade II (16 oz) is the top performer here because it kills Bermuda grass (an invasive perennial weed) in a Zoysia or Fescue lawn with class-leading selectivity. If you want fluazifop-P-butyl (a chemical that grass absorbs through its leaves) in a smaller, cheaper bottle, the 4-oz version is a smart alternative. For crabgrass in a Fescue lawn, the Pro Quinclorac concentrate (18.92% quinclorac, a chemical that targets crabgrass specifically) is your best bet. The winner for most homeowners who want professional-level control without wrecking their good turf is the lawn grass spray from Fusilade.
Our Picks at a Glance
How To Choose The Best Lawn Grass Spray
Not all grass-killing sprays are the same. The wrong one can destroy your entire garden bed. Here is what you need to know before you buy.
Active Ingredient: The Muscle Behind the Spray
The active ingredient (the chemical that does the killing) determines what it kills and what it spares. Fluazifop-P-butyl is a proven choice for killing Bermuda grass in Zoysia or Fescue lawns because the grass absorbs it through its leaves. Quinclorac targets crabgrass specifically and works best when you mix it with a surfactant (a wetting agent that helps the liquid stick to the leaf surface) so it stays on the leaf long enough to be absorbed. The concentration matters: a 24.5% concentrate goes much further than a ready-to-use 1% spray, so you get more killing power per gallon.
Selectivity: Only the Grass, Not the Garden
A true selective grass killer hits grassy weeds (Bermuda, crabgrass, tall fescue, quack grass) while leaving broadleaf ornamentals (flowers, shrubs, trees) and your desired lawn species unharmed. The product label lists exactly which turf types it is safe on. If you spray a non-selective product on a mixed bed, you lose everything green. Always match the product to your specific lawn type (Zoysia, Fescue, Centipede, Bermuda) and the weed you are targeting.
Form: Ready-to-Use vs. Concentrate
A ready-to-use (RTU) spray comes premixed in a hose-end or trigger bottle — you grab it and walk the yard. It is convenient for small flower beds and spot treatments, and costs less upfront. A concentrate (usually 4 oz to 32 oz bottles) requires you to mix it with water and a surfactant in a pump sprayer. That extra step pays off with a much lower cost per gallon and the ability to cover thousands of square feet. For any yard larger than a few hundred square feet, a concentrate makes more sense financially.
Quick Comparison
| Model | Best For | Active Ingredient | Coverage | Volume | Amazon |
|---|---|---|---|---|---|
| Fusilade II (16 oz)★ Best Overall | Bermuda in Zoysia/Fescue | Herbicide | 1,000 sq ft | 16 oz | Amazon |
| Syngenta Fusilade II (4 oz)Premium Pick | Over-the-top on ornamentals | 24.5% Fluazifop-P-butyl | Grass Weeds | 4 oz | Amazon |
| Pro Quinclorac | Crabgrass in fescue | 18.92% Quinclorac | Residual Control | 32 oz | Amazon |
| Fertilome Over The Top | Bermuda in flower beds | Herbicide | 2,000 sq ft | 8 oz | Amazon |
| Ortho Grass B Gon (2-pack) | Garden beds & shrubs | Grass Killer | Kills crabgrass, fescues, bermuda | 48 oz total | Amazon |
| Ortho Grass B Gon RTU | Small spot treatment | Grass Killer | Grassy weeds (selective) | 24 oz | Amazon |
In‑Depth Reviews
1. Fusilade Selective Herbicide II 73215
Our pick — over 4★ from 400+ verified ratings; the strongest balance of quality and price.
This professional-grade concentrate kills Bermuda grass in Zoysia and Fescue lawns without damaging your shrubs or flowers.
The Syngenta staple that lawn enthusiasts turn to when weaker sprays fail. It is designed for spot treatments and over-the-top applications (spraying directly over desirable plants), controlling perennial and annual grass weeds across turf and landscaped areas while leaving broadleaf ornamentals untouched. At 16 ounces, the bottle covers about 1,000 square feet at the standard mix rate. Because it is a concentrate, you mix small doses (like 0.2 ounces per gallon) into a pump sprayer — a single bottle lasts multiple seasons for most homeowners.
The key is the application rate. Buyers report that 0.2 ounces per gallon mixed with a non-ionic surfactant (a wetting agent that helps the spray stick to leaves) kills more than 90% of Bermuda in a Zoysia lawn with minimal stunting of the good turf. This is a huge advantage over ready-to-use sprays, since you need very little product to see results. The consensus among owners? Patience is a must: apply when Bermuda enters or exits dormancy (the inactive period), then wait one to two weeks for full browning. The only downside is the upfront cost — at over a hundred dollars per bottle, it is the most expensive entry here by a wide margin. But the coverage per application makes it cheaper per job than multiple failed attempts with weaker sprays.
The Case For It
- class-leading selectivity — kills Bermuda in Zoysia and Fescue without harming the good turf
- Concentrate format means a single bottle handles dozens of applications
- Rainfast in one hour (the spray dries before rain can wash it off), giving you flexible scheduling
The Trade-Offs
- High upfront cost compared to any ready-to-use spray
- Requires a separate surfactant and a pump sprayer — not grab-and-go
- Stronger mixes (0.4–0.6 ounces per gallon) severely stunt Zoysia recovery, so precise measuring is critical
Best for: Homeowners battling Bermuda grass in a Zoysia or Fescue lawn who want professional-level results and are comfortable mixing a concentrate yourself.
2. Syngenta Fusilade II Herbicide (4 oz)
A smaller, more affordable bottle of the same Fusilade chemistry (24.5% fluazifop-P-butyl), perfect for medium gardens and flower bed work.
This 4-ounce bottle packs the same 24.5% fluazifop-P-butyl concentrate as the larger 16-ounce version but at a significantly lower price — making it a smarter buy if you are treating a medium-sized garden or a few ornamental beds instead of a full acre. It controls both perennial and annual grass weeds, and is explicitly safe for use over the top of ornamentals in landscapes, nurseries, and even sports fields.
The label says it is rainfast in just one hour, with visible yellowing within a week on treated weeds. Buyers who tried other products before this one say it is the only thing that killed tough crabgrass. The standard mix is 0.75 ounces per gallon plus 0.5 ounces of non-ionic surfactant, which stretches a single 4-ounce bottle further than you would expect. That said, a few owners flag the safety precautions — full-body protective clothing and rubber gloves are required, and the main ingredient has a California Proposition 65 listing (a state warning label) as a possible carcinogen, so factor this in if children or pets use the treated area heavily.
The 4-ounce version holds 4 ounces compared to the 16-ounce bottle’s 16 ounces, so it suits smaller jobs or first-time users who want to test the chemistry before committing to a bigger investment. You are paying less per bottle, but the cost per gallon of mixed spray is nearly identical since the concentration is the same.
Smart compromise: You get professional Fusilade results for a fraction of the upfront cost, as long as your yard fits inside the 4-ounce bottle’s coverage footprint. Buyers who paired it with a surfactant say it killed invasive Bermuda grass in zone 9b lawns without harming the desired grass.
Reach for this if: You have crabgrass or Bermuda in a flower bed or Fescue lawn and want a potent concentrate without buying the full 16-ounce jug. Look elsewhere if: The protective-gear requirement makes you uncomfortable, or your yard is larger than a few thousand square feet.
3. Pro Crabgrass & Grassy Weed Killer (Quinclorac 32 oz)
This high-concentration quinclorac formula (a chemical that targets crabgrass) hits crabgrass hard while leaving your Fescue or Bluegrass lawn alone.
Liquid Harvest’s concentrate brings 18.92% quinclorac — a proven active for knocking out crabgrass, foxtail, barnyardgrass, and Dallisgrass — and also controls broadleaf weeds like clover and dandelion. The 32-ounce bottle is a serious volume for a concentrate, giving you residual control (the chemical remains active in the soil to prevent re-emergence) after the initial kill. The recommended mix is 1.5 ounces per gallon per 1,000 square feet, which works out to over twenty full tank loads from one bottle.
The speed is a standout. Owners mention visible discoloration the next day and full yellowing or browning by day four when they follow instructions carefully. The catch is the surfactant: the fine print says you need something to help the liquid stick to the leaves, and buyers who skipped this step saw little to no results even after two applications. For established crabgrass on Bermuda grass lawns, multiple reapplications are typically needed.
Why It Stands Out
- High 18.92% quinclorac concentration delivers maximum punch against crabgrass
- 32 ounces of concentrate provide massive coverage per dollar
- Residual control keeps weeds from returning quickly
What To Know
- Absolutely requires a surfactant — without it, results are poor, according to reviewers
- Multiple applications may be needed for old, established crabgrass
- Mixed feedback on value; some owners think it is overpriced compared to alternatives like the Fusilade concentrates
Best for: Someone with a Fescue or Bluegrass lawn fighting a crabgrass invasion who is willing to use a surfactant and follow the instructions precisely. Not for: A Bermuda grass lawn owner who wants a single-application miracle.
4. Fertilome 8 Oz Over The Top Grass Killer (10434)
A bargain concentrate that makes 8 gallons of spray solution for protecting flower beds and vegetable gardens.
The Fertilome Over The Top is a compact 8-ounce bottle, but it stretches surprisingly far — the label says it makes 8 gallons of finished spray, covering up to 2,000 square feet. That is a huge advantage over ready-to-use sprays that cost the same but cover a fraction of the area. It is designed to be safe around vegetables, trees, shrubs, and ornamentals, targeting both annual and perennial grass weeds like Bermuda and crabgrass.
Plant safety is the top positive aspect owners mention — nine buyers specifically say it does not harm flowerbeds or monkey grass (a common ornamental ground cover). The trade-off is that it works slowly: Bermuda grass in flower beds starts dying after about three weeks, not overnight. The grass stops growing within two days, but full kill takes time. Some owners found it effective only on short grass under six inches; taller grass was merely stunted. For the price, it is a solid entry, but the smell gets negative marks, and a handful of customers note it did nothing for their specific weed type.
At 8 ounces, this is the smallest bottle in the lineup alongside the 4-ounce Syngenta, but it covers far more ground than its size suggests. The liquid volume gap versus the Ortho Grass B Gon RTU (8 oz vs. 24 oz) is misleading because the Fertilome is a concentrate.
Honest trade-off: You get huge coverage from a tiny bottle if you are patient and keep expectations realistic about speed. Best paired with a surfactant (many owners use Dawn dish soap as a substitute) and applied when grass is young and short.
Go for this if: Protecting flower beds and monkey grass from Bermuda invasion is the goal, and you accept a three-week timeline. skip it if: You need rapid results or are treating overgrown, tall weeds.
5. Ortho Grass B Gon Garden Grass Killer Ready-to-Use (2-Pack)
The no-mix, no-measure two-pack that makes quick work of grass in Iris beds and around shrubs.
This is the grab-and-go option for anyone who does not want to fuss with a pump sprayer. Two 24-ounce bottles arrive ready to use — just point the nozzle and spray. It targets crabgrass, tall fescue, Bermuda, and annual bluegrass in non-edible garden beds, and is rainfast within one hour. The liquid volume totals 48 ounces, which is the most total ready-to-use product in this comparison, at 48 ounces versus the Fertilome’s 8 ounces.
What owners consistently praise is how well it spares ornamentals. Reviewers point out using it on Iris flower beds and seeing the grass die while the Irises thrived. Another used it around shrubs with the same result: “killed the grass, not my shrubs.” The main frustration is speed — it is not instant, and some owners had to reapply. A vocal minority say it did nothing at all after using the whole bottle on a small area. The variation in results likely comes from application technique (calm days, direct spray on grass blades only) and weed maturity. A few shipments arrived leaking, so check the bottle seal when it arrives.
The Upside
- Instant use — no mixing, no measuring, no clean-up
- Safe on Irises, shrubs, and other ornamentals when applied correctly
- Two bottles provide plenty of coverage for the average flower bed
The Downside
- Results vary widely — some owners saw zero effect
- Works too slowly for impatient gardeners
- Bottles can leak in transit if not packed carefully
Best for: A quick spot-treatment in flower beds around established ornamentals when you want zero prep work. Think twice if: You have a large area or a history of “tough” Bermuda that has resisted other sprays.
6. Ortho Grass B Gon Garden Grass Killer RTU (24 oz)
The entry-level single bottle for one-off clean-up of grassy weeds in ground covers and around trees.
This is the simplest, cheapest selective grass killer in the lineup. A single 24-ounce ready-to-use bottle is all you get — spray it on crabgrass, tall fescue, Bermuda, or Kentucky bluegrass in your flower beds and landscaping, and it will not harm broadleaf ornamentals, shrubs, or trees. The packaging says it is rainfast one hour after application, so you can spray even when the forecast is uncertain.
Owners who used it strictly as directed on calm days say it effectively killed grass that crept into flower beds from overseeded lawns. It is slow-acting — you may need a second application — but it beats digging weeds out by hand. The problem is the inconsistency: a notable portion of shoppers say it simply did not work, with one blunt review reading: “Sprayed this product on the grass I wanted killed and it didn’t kill any of it.” The difference sometimes depends on whether the spray reached the grass roots or just the tips. For the price, it is a low-risk trial, but the single 24-ounce bottle covers much less ground than the 48-ounce two-pack for only a small price difference.
If you are just cleaning up a few rogue grass clumps in a small bed, this is fine. For any ongoing battle, the two-pack or a concentrate makes more sense.
The honest read: It works best on young, small weeds where you can soak the entire plant. Older, established Bermuda or tall grass often shrugs it off. Consider it a low-cost first attempt, not a guaranteed solution.
Reach for this if: You need to kill a small patch of crabgrass or fescue in a flower bed and want the simplest possible solution. Look elsewhere if: You are fighting established Bermuda, need to cover a large area, or want guaranteed results.
Understanding the Specs
Active Ingredient Concentration
This is the percentage of the chemical that actually kills the weed. A higher number (like 24.5% fluazifop-P-butyl in the Syngenta Fusilade II 4 oz) means you use less product per gallon of water and the bottle lasts longer. Lower concentrations in ready-to-use sprays work best on small, young weeds and often require reapplication. Always check the label for the exact active name — fluazifop-P-butyl and quinclorac target different weed types and are safe on different lawn species.
Coverage Area
Measured in square feet, this tells you how much ground one bottle treats. A concentrate covering 2,000 square feet per 8-ounce bottle (like the Fertilome) is vastly more economical than a ready-to-use bottle that covers a few hundred square feet. For most residential yards, a concentrate with coverage of 1,000 square feet or more per bottle is the right call. If you are only spot-treating a small bed, a ready-to-use spray is fine.
Rainfast Time
This is how long the spray needs to dry on the leaf before rain can wash it off. Products in this guide range from one hour to a few hours. A shorter rainfast window gives you more scheduling flexibility — you can spray in the morning even if there is a chance of afternoon showers. Always check the label, because washing off the product before it dries wastes your time and money.
Surfactant Requirement
A surfactant (a wetting agent) helps the spray liquid spread evenly across the waxy surface of grass blades and stick there instead of beading up and rolling off. Several concentrates here require you to add a non-ionic surfactant (a type that does not interfere with the herbicide) at mixing time. Skipping this step is the most common reason for failure. Some owners use a few drops of dish soap as a substitute, though a proper surfactant is cheap and more reliable.
FAQ
Will a selective grass killer hurt my flowers or shrubs?
How long does it take for the spray to kill the grass?
Can I use these sprays on my lawn without killing the good grass?
What is the difference between a ready-to-use spray and a concentrate?
Why do some products need a surfactant and others do not?
Is it safe to use these sprays around vegetable gardens?
Can I spray when rain is in the forecast?
Will these sprays kill crabgrass in my lawn?
How long does a bottle of concentrate last in storage?
Which product is best for a Zoysia lawn with Bermuda invasion?
Final Thoughts: The Verdict
For most buyers, the lawn grass spray winner is the Fusilade Selective Herbicide II because it offers class-leading selectivity for Bermuda-in-Zoysia battles and delivers professional-grade results from a concentrate that lasts multiple seasons. If you want a smaller, more affordable entry point with the same active ingredient, grab the Syngenta Fusilade II 4 oz. And for a crabgrass-focused solution that works on Fescue and Bluegrass, the Pro Quinclorac 32 oz is the one to reach for. The crowd favorite remains the Fusilade line — proven performance from thousands of user-seasoned applications is tough to top.
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 July 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
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