A targeted post-emergent herbicide with the right active ingredients is the only reliable method to eliminate it without damaging your lawn.
I’m Rikta — the co-founder and writer behind Lawn Gear Lab. I’ve spent hundreds of hours comparing herbicide formulations, analyzing active ingredient synergies (2,4-D, dicamba, triclopyr, sulfentrazone, carfentrazone), studying application timing, and cross-referencing thousands of verified owner reports to compile this guide.
Whether you’re battling a few scattered rosettes or a full-blown plantain invasion, choosing a broadleaf plantain weed killer depends on matching the right chemistry and coverage to your specific grass type and infestation severity.
How To Choose The Best Broadleaf Plantain Weed Killer
Broadleaf plantain’s deep taproot and waxy leaf surface make it resistant to weak, contact-only herbicides. A selective, systemic post-emergent formulation that translocates to the root system is non-negotiable for permanent removal.
Active Ingredient Strategy: 2,4-D + Dicamba + Triclopyr
The most effective formulations combine at least three active ingredients. 2,4-D and dicamba attack leaf and stem tissue quickly, while triclopyr penetrates the waxy cuticle of broadleaf plantain and moves into the root system. A fourth ingredient like sulfentrazone or carfentrazone speeds up visible wilting within hours.
Application Method: Sprayer Compatibility
Ready-to-use spray bottles are convenient for spot-treating fewer than 20 weeds, but a handheld pump or backpack sprayer with a concentrate gives you precise control over the mix rate and allows you to fully saturate the low-lying rosette. Without thorough leaf coverage, the herbicide cannot translocate to the root.
Grass Safety and Turf Type Match
Not all selective herbicides are safe on every grass species. Cool-season lawns like Kentucky bluegrass, tall fescue, and perennial ryegrass tolerate most broadleaf weed killers. Warm-season grasses like St. Augustine and centipede require label-specific formulas to avoid injury. Always confirm the label lists your lawn’s grass type.
Quick Comparison
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| Model | Category | Best For | Key Spec | Amazon |
|---|---|---|---|---|
| Select Source Triad TZ | Concentrate | Quad‑action root kill | 4 active ingredients | Amazon |
| SpeedZone EW | Concentrate | Fast visible wilting | Carfentrazone‑ethyl | Amazon |
| Fertilome Weed Free Zone | Concentrate | Creeping charlie & thistle | 32 oz concentrate | Amazon |
| Bonide Weed Beater Ultra | Concentrate | 200+ weed species | 32 oz treats 10K sq ft | Amazon |
| Bonide Chickweed Clover & Oxalis Killer | RTU Spray | Small spot‑treat patches | 128 oz ready‑to‑use | Amazon |
| Trimec Classic | Concentrate | Large lawns & property | 1 gal covers 40K sq ft | Amazon |
| Southern Ag Crossbow | Concentrate | Brush & tough perennials | Makes 96 gal solution | Amazon |
In‑Depth Reviews
1. Select Source Triad TZ
The Select Source Triad TZ is the most well-rounded broadleaf plantain killer on this list because it packs four active ingredients — 2,4-D, dicamba, triclopyr, and sulfentrazone — into one quart. Broadleaf plantain’s waxy leaf surface requires a surfactant-like compound to penetrate, and triclopyr handles that job while sulfentrazone adds root-systems activity against stubborn perennial rosettes. Professional turf managers use this on residential lawns, golf courses, and athletic fields, which speaks to its safety and efficacy on cool-season grasses.
Owners report visible shriveling within hours and complete weed death in one to four weeks depending on temperature and soil moisture. The mix rate of 1 to 1.5 fluid ounces per gallon makes this concentrate economical for spot-treating a full acre. A non-ionic surfactant is recommended but not strictly required — adding one improves adhesion on plantain’s broad, flat leaves.
On the downside, the odor is strong when wet, and a few users received bottles with leaky caps during shipping. Also, this product is toxic if mishandled, so strict adherence to PPE guidelines is mandatory. For the combination of speed, spectrum, and root-killing depth, this is the definitive mid-range choice for serious plantain problems.
What works
- Four active ingredients attack plantain through multiple pathways
- Visible wilting in under 8 hours on warm days
- High value per ounce — covers large areas economically
What doesn’t
- Strong chemical odor during mixing and application
- Some bottles arrive with leaking caps
- Requires careful PPE handling due to toxicity
2. SpeedZone EW Lawn Weed Killer
SpeedZone EW is the go-to choice when you want to see results before the weekend ends. The inclusion of carfentrazone-ethyl — a rapid-contact herbicide that disrupts cell membranes on contact — gives it a visible speed advantage over three-way formulas. Users often report curled, browned leaves within two days and complete die-off of broadleaf plantain in under a week when temperatures stay above 50°F.
This formula is rainfast in three hours, which is among the shortest windows in the selective herbicide category. For cool-season lawn owners in early spring or late fall, that is a critical advantage. The label covers Kentucky bluegrass, perennial ryegrass, tall fescue, and zoysiagrass, making it versatile across the most common northern and transition-zone turf types.
Drawbacks include a relatively small 20-ounce bottle with no measuring cap — you’ll need to measure your own mix ratios carefully. Some owners found that spurge and nimblewill require a second application, and the label restricts reapplications to twice per year. For pure speed on broadleaf plantain rosettes, this is the premium choice.
What works
- Fastest visible wilting among all products reviewed
- Rainfast in just 3 hours for flexible application timing
- Safe on cool-season and warm-season turf varieties
What doesn’t
- Smaller bottle size with no integrated measuring cap
- Limited to two full-yard applications per season
- Less effective on spurge without a dedicated surfactant
3. Fertilome Weed Free Zone
Fertilome Weed Free Zone has earned a cult following among lawn enthusiasts specifically for its ability to eliminate creeping charlie and Canada thistle — two aggressive broadleaf perennials that share broadleaf plantain’s stubborn taproot and waxy leaf structure. The formula delivers injury evidence within hours of application, and the dicamba-triclopyr combination ensures translocation deep into the root system of rosette-forming weeds.
Owners consistently mention that a single pint mixed with water covers a substantial area, and the product is safe on Kentucky bluegrass, Bermuda, and zoysia. Some users report needing to increase the concentration to about double the label rate for clover, and adding three drops of dish soap as a wetting agent dramatically improves coverage on broadleaf plantain’s smooth leaves.
The main issue is cost per ounce — this is one of the more expensive concentrates in its class. A few reviews also note that the sprayer bottle design can make mixing ratios confusing if you’re not using a graduated measuring cup. For targeted elimination of broadleaf plantain alongside other tough perennials, this mid-range product delivers reliable results.
What works
- Highly effective on creeping charlie and thistle
- Visible damage within hours on warm days
- Safe on common cool and warm season grass types
What doesn’t
- Premium price per ounce compared to similar concentrates
- May require stronger mix ratios for clover
- Bottle design lacks clear measuring marks
4. Bonide Weed Beater Ultra
Bonide Weed Beater Ultra is a premium concentrate built for maximum spectrum coverage — the label claims over 200 broadleaf weed species, and the active ingredient stack of 2,4-D, dicamba, and triclopyr covers all the common rosette and clover-type weeds. For broadleaf plantain specifically, the triclopyr component ensures the herbicide penetrates the thicker leaf cuticle and moves into the deep taproot.
One pint of this concentrate treats roughly 10,000 square feet, making the 32-ounce bottle economical for a quarter-acre lawn. Injury appears within hours, and plant death occurs within 7 to 14 days under optimal conditions. The formula is rainproof once dry, which eliminates the need for a perfect 24-hour weather window.
The main trade-off is that this product demands a pump or backpack sprayer — the concentrate does not include a spray nozzle, and it must be mixed with water. Some owners note that multiple seasonal treatments are required for heavy infestations, and results on wild onion and wild violet are less consistent than on plantain. For a premium all-in-one broadleaf solution, this is a strong contender.
What works
- Extremely broad coverage — 200+ listed weed species
- Economical concentrate: 1 pint per 10,000 sq ft
- Rainproof after drying for flexible scheduling
What doesn’t
- Requires separate sprayer — not ready-to-use
- Multiple treatments needed for heavy infestations
- Less effective on wild violet and wild onion
5. Bonide Chickweed Clover & Oxalis Killer
The Bonide Chickweed Clover & Oxalis Killer is a ready-to-use spray that offers the simplest entry point for homeowners dealing with small broadleaf plantain patches. The active ingredients — dicamba, triclopyr, and another herbicide — mirror the chemistry of more expensive concentrates, but in a pre-mixed 128-ounce bottle that requires no measuring or mixing. Just attach the hose-end sprayer and treat affected areas.
Users report effective results on dandelions, chickweed, and clover, with visible browning within three days. The formula is nearly odorless, which is a welcome difference from concentrates that smell strongly of diesel. For spot-treating fewer than 30 plantain rosettes in a small lawn, this is the most budget-friendly and time-efficient option.
However, the hand sprayer included with the bottle is subpar for anything beyond a 2,000-square-foot lawn — reviewers consistently recommend pouring the liquid into a pump sprayer for better coverage. This product also struggles against established clover patches and may not penetrate the largest plantain rosettes on the first application. For quick, low-commitment spot treatments, this entry-level spray is perfectly adequate.
What works
- No mixing required — ready to use straight from the bottle
- Nearly odorless formula for pleasant application
- Affordable entry price for small infestations
What doesn’t
- Included hand sprayer is ineffective for large lawns
- Less reliable on mature, established clover patches
- Requires rain-free window of 48 hours for best results
6. Trimec Classic Broadleaf Herbicide
Trimec Classic is the premium bulk option for properties with significant broadleaf plantain pressure. A single gallon covers 27,000 to 40,000 square feet depending on your mix rate, which makes it the most cost-efficient solution per square foot among all products reviewed here. The formulation has been a professional turf standard for decades, with active ingredients optimized for clover, dandelion, and plantain control.
Owners note that it works effectively within a week on most broadleaf weeds, including plantain, and leaves no soil residue that would interfere with overseeding. The lack of odor is also frequently praised. For property owners managing more than half an acre of lawn, this gallon bottle eliminates the need for frequent reordering.
The primary disadvantage is the upfront investment — this is the most expensive single purchase on the list, and it only makes sense if you have at least 10,000 square feet of turf to treat. Additionally, some states have shipping restrictions on this herbicide, so availability may vary. For large-scale plantain eradication, the value proposition is unmatched.
What works
- Highest value per square foot — 40,000 sq ft per gallon
- Professional-grade formula trusted by turf managers
- No soil residue; safe for overseeding schedules
What doesn’t
- Significant upfront cost for the gallon size
- Shipping restrictions may block delivery to some states
- Overkill for small lawns under 5,000 square feet
7. Southern Ag Crossbow Specialty Herbicide
Southern Ag Crossbow is the heaviest-duty option on this list, formulated with 2,4-D and triclopyr (under the Garlon brand) for controlling woody brush and perennial broadleaf weeds. While it is labeled for tough targets like poison ivy, blackberry, and multiflora rose, its high triclopyr concentration makes it exceptionally effective against broadleaf plantain’s taproot system. This is the product to reach for when standard three-way formulas have failed.
The 1-gallon container makes up to 96 gallons of spray solution, covering over two acres of dense vegetation. Users report complete kill of all vegetation within 48 hours at a 2-ounce-per-gallon mix rate, making it ideal for clearing overgrown fence lines or large infested areas. The 3-day soil half-life means it breaks down relatively quickly compared to other heavy-duty herbicides.
However, Crossbow is not a selective lawn herbicide — it will kill grass if oversprayed, so precise spot application is critical. The strong odor persists for hours after spraying, and some states regulate its sale due to the high triclopyr content. For targeted plantain rosettes scattered in a lawn, this is overpowered; for clearing large-scale infestations on properties without desirable turf, it is unmatched.
What works
- Extreme potency against woody brush and deep-rooted perennials
- Incredible coverage — up to 96 gallons of mixed solution
- Relatively short 3-day soil half-life
What doesn’t
- Non-selective — kills grass on contact if oversprayed
- Strong, lingering chemical odor
- Not suitable for use on desirable turf lawns
Hardware & Specs Guide
Active Ingredient Synergy
The most effective broadleaf plantain killers combine 2,4-D for rapid leaf burn, dicamba for root translocation, and triclopyr for waxy cuticle penetration. Four-way formulas that add sulfentrazone or carfentrazone accelerate visible damage and improve cool-weather performance.
Rainfast Window
SpeedZone EW leads the category at 3 hours rainfast. Standard three-way formulas require 6 to 24 hours of dry weather. A shorter rainfast window is critical for spring and fall applications when afternoon showers are unpredictable.
FAQ
Why does broadleaf plantain keep coming back after I spray it?
Can I apply broadleaf plantain killer in hot summer weather?
How long after spraying can I mow my lawn?
Final Thoughts: The Verdict
For most gardeners, the broadleaf plantain weed killer winner is the Select Source Triad TZ because its four-ingredient formula delivers root-killing power without requiring a gallon-sized investment. If you want the fastest visible wilting, grab the SpeedZone EW. And for budget-friendly spot treatments on small lawns, nothing beats the convenience of the Bonide Chickweed Clover & Oxalis Killer.