A lawn speckled with dandelions, clover patches, or creeping Charlie isn’t just a cosmetic issue — it’s a signal that your turf is losing the battle for nutrients and space. The wrong herbicide can damage your grass, stall results, or leave roots intact for a rapid return. You need a formula that targets broadleaf weeds without stunting your lawn’s root system or requiring constant reapplication.
I’m Rikta — the co-founder and writer behind FitlyFast. My process for this guide involved cross-referencing active ingredient profiles like Trimec, Dicamba, and Mesotrione with real user results to isolate the formulas that deliver reliable knockdown on tough weeds across both cool-season and warm-season turf types.
This guide breaks down the top concentrates and ready-to-spray options based on weed spectrum, turf safety, and the speed of visible results. If you want a lawn that stays weed-free through the season, you need the right broadleaf weed killer for lawns.
How To Choose The Best Broadleaf Weed Killer For Lawns
Selecting a broadleaf herbicide comes down to understanding which weeds are invading your lawn, what type of grass you’re protecting, and how long you want the results to last. Many homeowners grab a general-purpose spray only to find it damages their Bermuda or fails to touch wild violet. Focus on the ingredient label and your grass species first.
Active Ingredient Blends Matter More Than Brand
The most effective products combine two or three active ingredients to target different weed families. Trimec (2,4-D + Mecoprop + Dicamba) is a classic for dandelions and clover. Adding Triclopyr or Sulfentrazone tackles tougher weeds like ground ivy and yellow nutsedge. Mesotrione offers pre- and post-emergent control, but it can bleach or stunt sensitive turf if applied in heat or drought.
Turf Grass Compatibility
Cool-season grasses like Kentucky bluegrass, tall fescue, and perennial ryegrass tolerate most broadleaf herbicides. Warm-season grasses such as St. Augustine, centipede, and Bahia are more sensitive — products containing 2,4-D or Dicamba can cause damage if applied during active growth. Always check the label for your specific grass type before mixing.
Coverage Volume and Concentrate vs. Ready-to-Spray
Concentrates offer better value per square foot and let you customize the dose for stubborn weeds. A 32-ounce bottle covering 5,000 to 16,000 square feet works for most small to medium lawns. If you have a large property exceeding 20,000 square feet, a gallon-sized concentrate (like the Spectracide or PBI/Gordon) reduces refill trips and cost per application.
Quick Comparison
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| Model | Category | Best For | Key Spec | Amazon |
|---|---|---|---|---|
| Select Source Triad TZ | 4-Way Blend | Tough broadleaf weeds + nutsedge | 4 active ingredients | Amazon |
| PBI/GORDON Trimec (Gallon) | Trimec Concentrate | Large lawns, cool-season grasses | 64,000 sq ft coverage | Amazon |
| Spectracide Large Plot | Gallon Concentrate | Large areas, 200+ weed types | 32,000 sq ft (north) | Amazon |
| Liquid Harvest Mesotrione | Pre/Post Emergent | Centipede grass, crabgrass control | Mesotrione 8 oz | Amazon |
| BioAdvanced Weed Killer | Triple-Action | 200+ weeds, root kill | 16,000 sq ft | Amazon |
| Southern Ag Trimec 32oz | Trimec Classic | 9 turf types, spot spraying | 5,000 sq ft | Amazon |
| GORDON’S Trimec 1qt | Trimec Liquid | Creeping Charlie, dandelions | 8,000 sq ft | Amazon |
In‑Depth Reviews
1. Select Source Triad TZ
This four-way blend combines 2,4-D, Dicamba, Triclopyr, and Sulfentrazone — a broad-spectrum arsenal that tackles the toughest broadleaf weeds like wild violet, ground ivy, and Virginia buttonweed, plus it suppresses yellow nutsedge. Users report visible shriveling within hours of application, with full weed death in one to four weeks depending on environmental conditions. The mix is quickly absorbed through leaves and stems, stopping growth almost immediately.
On cool-season grasses like bluegrass and tall fescue, Triad TZ shows excellent selectivity — it hits broadleaf weeds hard without browning the turf. Reviewers note that using a surfactant and a spray dye helps prevent overlap, especially on denser lawns. The quart covers between 48 to 96 fluid ounces per acre, making it a concentrated solution that stretches well for residential use.
One reviewer in Pennsylvania mixed it with Mesotrione on bluegrass/rye in early spring and saw roughly 95% elimination of clover and heavy weeds. Another in Texas reported Canadian thistle gone in one day. The main caution is toxicity — overspray can damage nearby ornamentals, and the odor is strong when wet. For most homeowners facing stubborn broadleaf invasions, Triad TZ is the most powerful tool in this lineup.
Why it’s great
- Four active ingredients cover the widest weed spectrum in this guide
- Visible knockdown in hours, full kill within weeks
- Suppresses yellow nutsedge — rare for a broadleaf formula
Good to know
- Strong chemical odor when wet; wear protective gear
- Overspray can harm flowers, shrubs, and vegetable beds
2. PBI/GORDON Trimec Lawn Weed Killer (Gallon)
This gallon-sized Trimec concentrate is a classic choice for homeowners with large cool-season grass lawns. Trimec combines 2,4-D, Mecoprop, and Dicamba — a proven trio that kills dandelions, clover, chickweed, and creeping Charlie without harming established turf. The label lists coverage between 32,000 and 64,000 square feet, making it ideal for one-gallon tanks or hose-end sprayers on properties over a quarter-acre.
An experienced reviewer, age 73, called it the best weed killer they’ve ever used, noting that it handled creeping Charlie in two to three days. Another user reported that Virginia buttonweed took about two weeks to fully die, but the lawn remained healthy. Some users advise doubling or tripling the Trimec portion for persistent weeds like wind-borne thistle or mature patches of ground ivy. The bottle ships as PBI/Gordon branded product, though one order arrived as ferti-lome Weed-Out — still functionally identical.
The one-gallon jug reduces per-ounce cost significantly compared to quart bottles. If you have a medium to large lawn and prefer stick-and-spray simplicity with a trusted Trimec formula, this is the volume to buy. Just ensure you’re using it on cool-season turf to avoid damage to warm-season grasses like St. Augustine or centipede.
Why it’s great
- Best per-ounce value for large lawns covering up to 64,000 sq ft
- Trusted Trimec blend with decades of proven results
- Safe for cool-season grasses when used as directed
Good to know
- Not ideal for warm-season grasses like St. Augustine or Bahia
- Stubborn weeds may require a stronger mix ratio
3. Spectracide Large Plot Weed Stop for Lawns Concentrate (1 Gallon)
Spectracide’s Large Plot formula is built for covering big lawns fast. The single gallon treats up to 32,000 square feet of northern grasses or 42,500 square feet of southern grasses — among the highest coverage per bottle in this guide. It kills more than 200 types of listed broadleaf weeds including dandelion, chickweed, clover, and dollar weed. The concentrate is rainproof in six hours, so you don’t have to worry about a surprise shower wasting your work.
Users report fast results: weeds begin wilting within hours, and the lawn stays green. One reviewer with centipede grass noted it killed dandelions without harming the turf. However, a few users say it works slower on tougher weeds like bull head sticker and foxtail, requiring a second application. If you have large patches of dollar weed or chickweed, this concentrate delivers solid first-round results at a low per-square-foot cost.
For those who manage multiple acres or simply hate mixing small batches, the 1-gallon container reduces trips to the sprayer refill station. The formula is effective on both northern and southern lawns, making it versatile across regions. Just be prepared for slower action on deeply rooted or waxy-leaved weeds that may need a follow-up spray.
Why it’s great
- Exceptional coverage for large yards — up to 42,500 sq ft
- Rainproof in 6 hours for flexible scheduling
- Works on both northern and southern grass types
Good to know
- Less effective on tough weeds like foxtail and bull head sticker
- May require higher mix ratio for stubborn broadleaf species
4. Liquid Harvest Mesotrione (8 oz)
Mesotrione is a unique herbicide that works both pre-emergently (preventing crabgrass seed germination) and post-emergently (killing emerged broadleaf weeds and grasses). Liquid Harvest’s 8-ounce concentrate targets 46 species including barnyard grass, chickweed, clover, crabgrass, and dandelion. It’s safe on St. Augustine grass (sod only), centipede grass, buffalo grass, and all cool-season turf types — but avoid it on bentgrass, zoysiagrass, and actively growing bermudagrass.
The product bleaches white the foliage of susceptible weeds within days, a visual confirmation that the chemical is working. Activation requires water — if no rain falls within 10 days, you need to irrigate with 0.15 inches. One reviewer in Nebraska called it the only product that worked on crabgrass in their region, while another noted it killed wild violet without damaging centipede grass. A common tip is to use a battery-powered 2-gallon sprayer with dye to prevent overlapping.
It’s slower than Trimec-based formulas; full weed death can take two to three weeks. Some users reported temporary discoloration of Bermuda grass under stress. If you overseed, Mesotrione is seed-safe, meaning you can reseed immediately after application. For homeowners who want a single product for both crabgrass prevention and broadleaf control, this is the most versatile option in this guide.
Why it’s great
- Pre-emergent and post-emergent in one bottle
- Safe on centipede and St. Augustine (sod) — rare for a broadleaf product
- Seed-safe; overseed anytime without waiting
Good to know
- Slower acting than Trimec — takes 2–3 weeks for full kill
- Can bleach turf if applied during heat or drought stress
- Not for use on bentgrass, zoysiagrass, or actively growing Bermuda
5. BioAdvanced Weed Killer for Lawns (32 oz)
BioAdvanced’s concentrate is formulated with Dicamba, Mecoprop-P, and dimethylamine salt to kill over 200 broadleaf weeds including clover, dandelion, and dollar weed. It markets itself as a “root killer,” meaning the active ingredients travel to the root system to prevent regrowth. The label covers up to 16,000 square feet, which is solid for a 32-ounce bottle — double the coverage of the Southern Ag Trimec at a similar price point.
Users report effective results on dollar weed, dandelions, and chickweed, especially when followed with a balanced fertilizer like 13-13-13. One reviewer noted it saved them money by replacing heavy Weed & Feed treatments. However, performance is inconsistent on nutgrass and crabgrass — some users saw only partial reduction. A few Bermuda owners reported temporary browning that recovered after a week. The sprayer mechanism on the bottle can be stiff to engage; some users prefer to mix into a pump sprayer for better control.
For the core broadleaf weeds that plague most lawns — clover, dandelion, plantain — BioAdvanced delivers reliable root kill at a competitive price per square foot. If you have a mix of regular broadleaf weeds and a few toughies like nutsedge, consider pairing this with a dedicated nutsedge killer for full coverage.
Why it’s great
- Kills weeds to the root to reduce regrowth
- Covers up to 16,000 sq ft per 32-ounce bottle
- Effective on common weeds like dollar weed, clover, and dandelion
Good to know
- Less effective on nutgrass and crabgrass
- May cause temporary browning on Bermuda grass
- Sprayer tab can be difficult to engage
6. Southern Ag Trimec (32 oz)
Southern Ag’s Trimec formula is a straight-to-business combination of 2,4-D, Mecoprop, and Dicamba — the same patented trio used in professional turf management. It’s labeled for use on nine turf types including Bermuda, St. Augustine, centipede, and zoysia. The 32-ounce bottle covers up to 5,000 square feet, making it an ideal entry-level concentrate for small lawns or targeted spot spraying.
User reviews highlight rapid knockdown on common broadleaf weeds. One reviewer wiped out a clover and dandelion invasion in two weeks without damaging the lawn. Another called it “the final winner” against onion grass when mixed with a surfactant. The biggest complaint is regrowth speed — weeds may return faster than with higher-concentration blends, requiring reapplication every few weeks during peak growing season. Users recommend mixing 2 ounces per gallon of water and avoiding rain for 24 hours.
For homeowners with a small yard (under 5,000 square feet) who want a proven Trimec solution without investing in a gallon jug, this is a practical starting point. Pair it with a surfactant for waxy-leafed weeds like wild violet or clover, and be prepared for spot treatments every three to four weeks during summer.
Why it’s great
- Proven Trimec blend safe for 9 turf types
- Fast knockdown on dandelion, clover, and chickweed
- Low entry cost for small lawns and spot treatments
Good to know
- Weeds may regrow faster; reapply every 3–4 weeks
- Only covers 5,000 sq ft per bottle — limited for larger yards
7. GORDON’S Trimec Lawn Weed Killer (1 qt)
GORDON’S Trimec delivers the same active ingredients as the Southern Ag option — 2,4-D + Mecoprop + Dicamba — but in a quart-sized bottle that covers up to 8,000 square feet. That’s 60% more coverage than Southern Ag’s 32-ounce version for a similar price, making it a budget-friendly choice for medium-sized lawns. Users report good results on creeping Charlie and dandelions, with some success on clover as well.
A former commercial turf technician praised Trimec for its reliability, noting they used it professionally and now for their own lawn. Another reviewer with creeping Charlie said the product eliminated it effectively. However, some users found it slow on clover, requiring multiple passes. The liquid is a classic Trimec concentrate — no fancy additives, just proven chemistry. Users recommend applying on a calm day to avoid drift onto flower beds.
If you keep your lawn simple — mostly fescue or bluegrass with standard broadleaf weed issues — this quart bottle offers the best coverage-to-cost ratio in the Trimec category. For larger yards, stepping up to the PBI/Gordon gallon version will save you money in the long run.
Why it’s great
- Excellent coverage for the price — 8,000 sq ft per quart
- Proven performance on creeping Charlie and dandelions
- Professional-grade Trimec at an accessible entry price
Good to know
- Slow acting on clover; may require two applications
- Can drift in wind; apply only on calm days
FAQ
How long does it take for a broadleaf weed killer to show results?
Can I use a broadleaf weed killer on St. Augustine grass?
Why do weeds return after I spray a broadleaf killer?
Final Thoughts: The Verdict
For most users, the broadleaf weed killer for lawns winner is the Select Source Triad TZ because its four-ingredient blend of 2,4-D, Dicamba, Triclopyr, and Sulfentrazone handles the widest range of tough weeds — including wild violet and creeping Charlie — without harming cool-season turf. If you want a cost-effective solution for a large cool-season lawn, the PBI/GORDON Trimec Gallon delivers unbeatable coverage per dollar. And for warm-season grass owners who need a pre- and post-emergent in one bottle, the Liquid Harvest Mesotrione is the most versatile pick.