Best Weed Killer For Lawns

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A weed killer for lawns has one job that a general weed and grass killer cannot do: kill the weeds and leave the grass. That makes the grass type the first spec to check, because the listings name different grasses they are meant for. The eight products below split into cool-season lawn products, southern lawn products, general broadleaf killers that name no grass type, and two specialists, one for nutsedge and one for moss. All details come from the Amazon listings as checked on 2026-10-17. The product label is the final word on use, and this guide does not replace it.

Quick answer: match the product to your lawn

• Cool-season grasses (Kentucky bluegrass, fescue, ryegrass): Ortho WeedClear Lawn Weed Killer Concentrate lists those three plus Bermudagrass, Buffalograss and Zoysiagrass; BioAdvanced All-in-One lists Kentucky bluegrass, ryegrass and fescue.
• Southern grasses (St. Augustine, centipede, zoysia, bermuda): BioAdvanced Southern Weed Killer for Lawns (not for Floratam, per the listing) or Southern Ag Atrazine for St. Augustine and centipede.
• Largest stated coverage per bottle: Spectracide Weed Stop for Lawns, 40 oz for up to 20,000 sq ft.
• Nutsedge: Image Nutsedge Killer for Southern Lawns. BioAdvanced All-in-One also lists yellow nutsedge.
• Moss, algae and broadleaf weeds: Bonide Captain Jack’s Lawnweed Brew, a 32 oz iron-based concentrate per its listing.
• Bulk concentrate for a big lawn: Triple Threat, 1 gallon, with a state exclusion list on the page.

What the person typing this phrase wants

The person typing “weed killer for lawns” wants to remove dandelions, clover or crabgrass without damaging the turf. The listings and the label settle that, so this guide covers grass type, the weeds each product names, coverage, and how it is applied. It makes no claims about effects on people, pets or wildlife. The listings here do not state those, and the label is where such statements belong.

What the university and EPA pages say

The EPA page “How to Read a Pesticide Product Label” opens with “the label is the law” and says to read the entire label first. It notes that using a product in a way that conflicts with its labeling violates federal law. An Iowa State University Extension article (dated 2007, so check current guidance) says fall, mid-September through October, is the best time to control perennial broadleaf weeds because the weeds are moving food to their roots then. It lists 2,4-D, MCPP, MCPA, dicamba and triclopyr as the effective active ingredients, says products mixing two or three of them work best because no single one controls every broadleaf weed, and advises against spraying in winds above 5 mph. It says to read and follow label directions before applying any herbicide. The article warns its information may not be current, so use it as background and the label as the rule.

Worked example: how much for a 6,000 sq ft lawn

For example, take a 6,000 sq ft lawn (60 ft by 100 ft). From each listing’s coverage figure, our arithmetic gives these amounts, and the label’s mixing rate is the real instruction. The Ortho 32 oz bottle treats up to 5,000 sq ft, so one bottle leaves 1,000 sq ft untreated and you need 6,000 divided by 5,000, or 1.2 bottles. The Spectracide 40 oz bottle treats 20,000 sq ft, so the lawn uses 30 percent of one bottle. The Southern Ag Atrazine quart treats 3,720 sq ft, so 6,000 sq ft needs about 1.6 quarts. The Triple Threat listing says 8 oz in 6 gallons of water covers 2,500 sq ft, so 6,000 sq ft calls for 6,000 divided by 2,500 times 8 oz, which is 19.2 oz of the 128 oz jug. The listing for Ortho is a pack of 2, so two 32 oz bottles cover 10,000 sq ft, and that covers this lawn once with 4,000 sq ft to spare.

How we chose

We searched Amazon for “weed killer for lawns” and a selective-herbicide variation, and kept products whose titles or bullets say they are for lawns or turf and do not harm the grass when used as directed. Two search results, Spectracide Weed & Grass Killer and Ortho GroundClear Weed & Grass Killer, are titled as weed and grass killers, so we did not treat them as lawn products and did not open their listings. We read each kept product page and copied only what it says, including the active ingredients where they are named. No prices, ratings or review counts are shown. Check the current price on Amazon.

Comparison table: what each listing states

Product	Form and size (listing)	Coverage (listing)	Grasses named (listing)	Weeds named (listing)	Active ingredients (listing)
Ortho WeedClear Concentrate	32 oz concentrate; listing is a pack of 2	5,000 sq ft per 32 oz	Bermuda, Buffalo, Fescue, Kentucky bluegrass, Ryegrass, Zoysia	Crabgrass, dandelion, clover	“Herbicide”
Spectracide Weed Stop for Lawns	40 oz concentrate; pack of 2	20,000 sq ft per 40 oz	“Lawns”, types not listed	Dandelion, chickweed, clover; “more than 200″	Not stated
BioAdvanced Southern Weed Killer	Ready-to-use, 1 gal; pack of 2	Broadleaf weeds in Southern lawns	St. Augustine, Centipede, Zoysia, Bermuda; not Floratam	Dandelion, dollarweed, clover, chickweed	Dicamba, mecoprop-P
BioAdvanced All-in-One	Ready-to-use spray, 1 gal	Selective; up to 3 months of control (claim)	Kentucky bluegrass, Ryegrass, Fescue	Mature crabgrass, dandelion, clover, foxtail, yellow nutsedge	Topramezone, bentazon
Bonide Lawnweed Brew	32 oz concentrate	Not stated	“Not lawn grasses”; types not listed	Dandelion, moss, algae, lichens, chickweed, oxalis, clover, ground ivy	“See label”; derived from iron
Southern Ag Atrazine	32 oz (1 quart)	3,720 sq ft per quart	St. Augustine, Centipede	Not named	“Herbicide”
Image Nutsedge Killer	24 oz liquid	Not stated	Bermuda, Zoysia, St. Augustine and others listed	Yellow and purple nutsedge, dollarweed, crabgrass, sandspur	“Herbicide”
Triple Threat Selective	1 gallon concentrate	8 oz in 6 gal water for 2,500 sq ft	“Lawns and turf”; types not listed	Broadleaf weeds; poison oak and ivy	“Herbicide”

The eight products, one card each

The order goes from cool-season lawns to southern lawns, then specialty products. It is not a quality ranking. The listings are the manufacturers’ claims and have not been independently verified, and all use must follow the product label.

Mistakes to avoid

• Skipping the label. EPA’s page says the label is the law, and using a product against its labeling violates federal law.
• Buying by the weed list on the front. Listings say “see label for complete list”. Read the label.
• Using a southern product on a cool-season lawn, or the reverse. Check the named grass types first, and note the “not Floratam” exclusion.
• Spraying in wind. The Iowa State article advises against spraying when winds exceed 5 mph.
• Trusting a pack-of-2 listing as a single unit. The Ortho, Spectracide and BioAdvanced Southern listings carry “per-pack” text.

Who should skip a lawn weed killer

If the weeds are a few plants, pulling them is an option, and no listing here makes a case for spraying a small patch. If your lawn type is unknown, find it out first, because the grass type decides which products apply. If you need statements about people, pets or wildlife, none of these listings gives them; read the label before you buy. Hose-end products also depend on your hose connection, and our guides on quick-connect hose fittings and a hose connector with a shut-off valve cover the fittings side.

Related guides on this site

• quick connect fittings for a water hose
• garden hose connector with shut-off valve
• inside diameter of a garden hose

Sources opened: EPA, How to Read a Pesticide Product Label; Iowa State University Extension, Control of Broadleaf Weeds in the Lawn (2007).

Frequently asked questions

What does a selective lawn weed killer do?

It targets the weeds named on the label and, when used as directed, is meant to leave the lawn grasses named on the label. The listings say this in their own words, such as “won’t harm lawn grasses when diluted and used as directed”. The label sets the conditions.

When is the best time to treat broadleaf weeds?

An Iowa State University Extension article dated 2007 says mid-September through October is the best time for perennial broadleaf weeds. Product labels set their own timing and temperature limits, so follow the label.

Which product names its active ingredients?

Two do: BioAdvanced All-in-One (topramezone and bentazon) and BioAdvanced Southern (dicamba and mecoprop-P). The others say “Herbicide”, “See label” or nothing.

Can I use these on any lawn?

No. Listings name specific grass types, and the BioAdvanced Southern listing says not to use it on Floratam. Triple Threat cannot be sold in a list of states.

Are these safe for pets and people?

None of the listings gives a safety statement we can check, and this guide makes none. Read the safety, first aid and re-entry sections of the product label before use.

Conclusion: the decision rule

Start with your grass, then pick the weeds. For cool-season turf, Ortho WeedClear or BioAdvanced All-in-One. For southern turf, BioAdvanced Southern, Southern Ag Atrazine or Image. For the largest stated coverage, Spectracide Weed Stop. For moss, Bonide. For a very large lawn and a mixing job, Triple Threat. Whatever you choose, read the whole label first, check the current price on Amazon, and treat in the window the label gives.