Product Reviews
Best Weed Killer for Lawns: Match It to the Weed
There is no best weed killer for lawns, only the right one for your weed: the seven chemistries that matter, what each kills, and the one that kills grass too.
Non-Selective Systemic Herbicide (concentrate)
Compare-N-Save Concentrate Grass & Weed Killer, 41% Glyphosate (1 gal) Review
★★★★☆ 4/5
our editor rating how we score4.5/5 from 19,472 shoppers at Amazon — their number, not ours.
$36–$42
Typical price · 1 gal concentrate; at the common 2.5 oz per gallon spot rate it makes roughly 50 gal of finished spray
Affiliate links — see our disclosure. Commissions never influence verdicts.
The cheapest way to buy plain glyphosate — and the fastest way to put a dead brown patch in a lawn if you spray it there.
Our Verdict
Rated on what it is rather than what people hope it is. As a generic 41% glyphosate concentrate it is honest, economical and effective: it moves systemically to the root, so it finishes perennials that contact burndowns only singe. It is also completely non-selective. It has no place on a lawn you intend to keep, and the four-star rating reflects hardscape and renovation use — killing off an old lawn before reseeding, clearing gravel, fence lines and bed edges. If you want weeds gone but grass kept, this is the wrong shelf entirely; you want a selective broadleaf product.
✅ Pros
- Systemic — reaches the root, so perennial weeds do not regrow the way they do after a burndown
- Far cheaper per treated area than any ready-to-use bottle
- The standard tool for a full lawn kill-off before reseeding or sodding
- No soil residual, so you can replant the area after the label interval
⚠️ Cons
- Non-selective — it kills turfgrass exactly as readily as the weed
- Requires measuring and mixing; there is no ready-to-use convenience here
- Nothing in the bottle prevents next season's germination
- Drift onto desirable plants is the most common way people damage their own landscape with it
Product type
Non-Selective Systemic Herbicide (concentrate)
Active ingredient
Glyphosate 41% (isopropylamine salt)
Price range
$36–$42
Coverage
1 gal concentrate; at the common 2.5 oz per gallon spot rate it makes roughly 50 gal of finished spray
Best for
Killing off an existing lawn before renovation, plus gravel, fence lines and hardscape
our editor rating
4 out of 5
Where our facts come from
Label read on EPA's label database
EPA Reg. No. 84009-12
We opened this product's accepted label on EPA's own Pesticide Product Label System — the strongest source available for what a product is registered to do.
What we found when we read it
Label read 2026-08-02 on EPA PPLS. Registered as 'Gly-4 Plus Herbicide' with 'Compare-N-Save 41% Glyphosate Grass & Weed Killer' as an alternate brand name — the shelf name and the registered name differ, which is normal for this product and worth knowing when checking it. Glyphosate isopropylamine salt 41.0%. Two entries in the weed table matter for our guides: POISON IVY / POISON OAK at 4-5 qt/acre or a 2% hand-held solution, noted 'For control. Repeat applications may be required to maintain control. Fall treatments must be applied before leaves lose green color'; and KUDZU at 4 qt/acre or 2%, 'For control. Repeat applications may be required.' Blackberry and honeysuckle are also on it.
Where this page and the container disagree, the container wins — the label is the legal authority on rates and restrictions. How to read one yourself.
Where This Product Matters
Matched against each state's actual disease, weed and pest pressure.
Alabama
Alabama hub →Nutsedge
Arizona
Arizona hub →Purple nutsedgeBermudagrass mites
Arkansas
Arkansas hub →Nutsedge (Delta ground that stays wet)
California
California hub →Common bermudagrass invading fescue lawnsNutsedge (yellow and purple)
Connecticut
Connecticut hub →Yellow nutsedge (the wet low corners of a till lawn)
Delaware
Delaware hub →Yellow nutsedge (the wet clay corners in the north and the irrigated sand in the south, for opposite reasons)
Florida
Florida hub →Yellow & purple nutsedge
Hawaii
Hawaii hub →Kyllinga and nutsedge in wet ground
Idaho
Idaho hub →Quackgrass, a perennial grass with no selective answer inside a lawn
Illinois
Illinois hub →Quackgrass
Indiana
Indiana hub →Nutsedge (wet clay pockets)
Kansas
Kansas hub →Spring dead spot on bermudagrassYellow nutsedgeBuffalograss and bermudagrass encroaching as weeds in a fescue lawn, which is the transition zone working against you
Louisiana
Louisiana hub →Nutsedge
Maryland
Maryland hub →Nutsedge (wet Coastal Plain ground)
Minnesota
Minnesota hub →Quackgrass
Mississippi
Mississippi hub →Nutsedge
Missouri
Missouri hub →Nutsedge (claypan ground that stays wet)
Montana
Montana hub →Quackgrass, a perennial grass weed with no selective answer inside a lawn
Nebraska
Nebraska hub →Yellow nutsedge in the irrigated low spots
Nevada
Nevada hub →Bermudagrass mites (southern lawns)
New Jersey
New Jersey hub →Nutsedge (wet coastal-plain soils)
New Mexico
New Mexico hub →Spring dead spot on bermudagrass, appearing as the lawn greens upBermudagrass encroaching into a northern bluegrass lawn, which is the transition zone working against youBermudagrass mites in the south
North Dakota
North Dakota hub →Quackgrass, a perennial grass weed with no selective answer in a lawn
Oklahoma
Oklahoma hub →Bermudagrass mites
Rhode Island
Rhode Island hub →Yellow nutsedge (the wet hollows in till lawns)
South Carolina
South Carolina hub →Nutsedge
South Dakota
South Dakota hub →Quackgrass, a perennial grass weed with no selective answer inside a lawn
Tennessee
Tennessee hub →Nutsedge
Texas
Texas hub →NutsedgeBermudagrass mites
Virginia
Virginia hub →Nutsedge
West Virginia
West Virginia hub →Yellow nutsedge in the wet spots the fragipan creates
Wisconsin
Wisconsin hub →Quackgrass
Wyoming
Wyoming hub →Quackgrass, a perennial grass with no selective answer inside a lawn
Common questions
Common Questions
How much does Compare-N-Save Concentrate Grass & Weed Killer, 41% Glyphosate (1 gal) cost?
Compare-N-Save Concentrate Grass & Weed Killer, 41% Glyphosate (1 gal) typically runs $36–$42, covering 1 gal concentrate; at the common 2.5 oz per gallon spot rate it makes roughly 50 gal of finished spray.
What does Compare-N-Save Concentrate Grass & Weed Killer, 41% Glyphosate (1 gal) treat?
Compare-N-Save Concentrate Grass & Weed Killer, 41% Glyphosate (1 gal) targets kudzu, poison ivy, Bermudagrass, Quackgrass, Nutsedge.
What is the active ingredient in Compare-N-Save Concentrate Grass & Weed Killer, 41% Glyphosate (1 gal)?
Glyphosate 41% (isopropylamine salt), registered under EPA Reg. No. 84009-12.
What is the biggest downside of Compare-N-Save Concentrate Grass & Weed Killer, 41% Glyphosate (1 gal)?
Non-selective — it kills turfgrass exactly as readily as the weed
Does Compare-N-Save 41% Glyphosate Concentrate kill kudzu?
Yes — the label for Compare-N-Save 41% Glyphosate Concentrate lists kudzu, and we rate it 4/5 for that job. Our verdict above says what earned the rating and where the limits are.
Does Compare-N-Save 41% Glyphosate Concentrate kill poison ivy?
Yes — the label for Compare-N-Save 41% Glyphosate Concentrate lists poison ivy, and we rate it 4/5 for that job. Our verdict above says what earned the rating and where the limits are.
Does Compare-N-Save 41% Glyphosate Concentrate kill Bermudagrass?
Yes — the label for Compare-N-Save 41% Glyphosate Concentrate lists Bermudagrass, and we rate it 4/5 for that job. Our verdict above says what earned the rating and where the limits are.
Where can I read the label for Compare-N-Save 41% Glyphosate Concentrate?
The accepted label is linked from this page, and the product is EPA Reg. No. 84009-12 — the number to search if the link ever moves. The label is the legal document; anything on this page that disagrees with it is wrong.
Real feedback
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