Does Roundup Kill Grass? 13 Labels Sorted by Lawn Grass

So does Roundup kill grass in your case? Check the EPA Reg. No. on the back panel, not the brand name. We sorted 13 lawn grasses against 13 current Roundup-brand labels, and the split is sharp: every Weed & Grass Killer label says it is not for spot weed control in lawns because it kills lawn grasses, while the 6 Roundup For Lawns registrations list grasses they leave alone. Weed & Grass Killer4 carries no glyphosate at all, part of a 2024 switch that University of Tennessee Extension (W 1237) flagged as a source of confusion.

The newer formula still kills grass because of dose. Fluazifop, its grass killer, is the same active that Fusilade II sprays over tall fescue and zoysia to thin out bermuda, at 0.05 to 0.09 lb per acre. Mixed and sprayed the way the Roundup label directs, it delivers about 1.16 lb per acre, roughly 12 times the tall fescue rate.

Which Roundup kills grass? 8 product lines compared

Roundup product (EPA Reg. No.)	Active ingredients	Kills lawn grass?	First symptoms	Complete kill	Rainproof	Plant lawn seed after
Weed & Grass Killer Super Concentrate (71995-25)	Glyphosate 50.2%	Yes: label says it “kills lawn grasses”	2 to 4 days	1 to 2 weeks	30 min	3 days
Weed & Grass Killer Concentrate Plus (71995-29)	Glyphosate 18%, diquat 0.73%	Yes	9 to 12 hours	1 to 2 weeks; perennials 4+ weeks	10 or 30 min	3 days
Weed & Grass Killer4, ready-to-use and concentrate (71995-65, 71995-64)	Triclopyr, fluazifop-P-butyl, diquat; no glyphosate	Yes: label says it kills lawn grasses	3 to 6 hours	1 to 2 weeks; perennials 4+ weeks	10 or 30 min	7 days
Super Concentrate Weed & Grass Killer2 (71995-72)	Triclopyr 5.0%, fluazifop-P-butyl 3.6%, diquat 1.5%; no glyphosate	Yes	6 hours	1 to 2 weeks; perennials 3 to 4+ weeks	30 min	7 days
Max Control 365, concentrate (71995-49) and ready-to-use (71995-51)	Glyphosate, imazapic, diquat	Yes, and imazapic blocks regrowth and new seed	12 hours	1 to 2 weeks; perennials 4+ weeks	30 min	1 year; label bars lawns
For Lawns1 and For Lawns3, Northern (2217-917-71995, 2217-918-71995)	MCPA, quinclorac, dicamba, sulfentrazone	No on bluegrass, ryegrass, fescues, bermuda, buffalo, zoysia; bars St. Augustine, bahia, centipede, bentgrass, carpetgrass	Hours (label claim)	Up to 3 weeks for some weeds	3 hours	4 weeks
For Lawns4 and For Lawns6, Southern (2217-1009-71995, 2217-1010-71995)	2,4-D, dicamba, penoxsulam, sulfentrazone	No on 11 listed grasses incl. Floratam St. Augustine; bars bentgrass, carpetgrass	A few days	14 to 28 days	4 hours	No seeding section; optional claim says 1 week
For Lawns Crabgrass Destroyer2 (71995-70, 71995-71)	Topramezone	No on bluegrass, fescues, perennial ryegrass; bars bermuda, zoysia, St. Augustine, bahia and 4 more	Weeds turn white in 4 to 7 days	Some weeds need a 2nd spray at 3 to 4 weeks	3, 6 or 24 hours	1 day (71995-70) or 28 days (71995-71)

"Kills lawn grass" is a label statement, not our rating. Rainproof times run from 10 minutes (71995-29) to 4 hours (Southern For Lawns) and up to 24 hours on some Crabgrass Destroyer bottles, so a shower 1 hour after a For Lawns spray can wash out the treatment. The planting column only matters if you mean to reseed; our page on how long Roundup stays in soil carries the half-lives behind those waits.

Grass by grass: which Roundup label names your lawn?

Find your grass, then read across. Two cells to watch: the Northern For Lawns label (2217-917) says do not use on St. Augustine, bahia or centipede, and Crabgrass Destroyer (71995-70) bars 8 grasses including bermuda and zoysia. A Southern For Lawns bottle is the only Roundup that lists Floratam St. Augustine as tolerant, and only between 50 and 85°F.

Swipe the table sideways to see every column.

Lawn grass	Glyphosate W&G Killer (71995-25)	Fluazifop W&G Killer4 / Killer2 (71995-65, 71995-72)	For Lawns Northern (2217-917)	For Lawns Southern (2217-1010)	Crabgrass Destroyer (71995-70)
Kentucky bluegrass	Kills: named target	Kills: named on both	Labeled safe	Labeled safe	Labeled safe
Perennial ryegrass	Kills: named target	Kills: named on 71995-65, not on 71995-72	Labeled safe	Labeled safe	Labeled safe
Tall fescue	Kills: named target (fescue species)	Kills: named on both	Labeled safe	Labeled safe	Labeled safe
Fine fescue (red, Chewings, hard)	Kills: named target (fescue species)	Kills: named on 71995-65 (fescue species), not on 71995-72	Labeled safe	Labeled safe	Labeled safe
Bermudagrass	Kills: named target; may need a repeat	Kills: named on both; may need a repeat	Labeled safe; may yellow; no spray above 85°F	Labeled safe; hybrids may yellow	Do not use
Zoysiagrass	Kills: named target	Kills: named on 71995-65, not on 71995-72	Labeled safe	Labeled safe; dormant zoysia allowed	Do not use
St. Augustinegrass	Kills: named target	Kills: named on both	Do not use	Labeled safe incl. Floratam; 50 to 85°F only	Do not use
Centipedegrass	Not named	Kills: named on 71995-72, not on 71995-65	Do not use	Labeled safe; may yellow; 85°F limit	Not named
Bahiagrass	Kills: named target	Kills: named on both	Do not use	Labeled safe	Do not use
Buffalograss	Not named	Not named	Labeled safe	Labeled safe	Do not use
Seashore paspalum	Not named	Not named	Not named	Labeled safe	Do not use
Creeping bentgrass	Kills: named target	Kills: named on 71995-65, not on 71995-72	Do not use	Do not use	Do not use
Carpetgrass	Not named	Not named	Do not use	Do not use	Do not use

The fluazifop labels disagree with each other. The 2023 Weed & Grass Killer4 master label (71995-65) names zoysia, perennial ryegrass, fine fescue and creeping bentgrass among targets; the June 2026 Super Concentrate2 label (71995-72) names none of them but adds centipedegrass. Fusilade II calls zoysia and fine fescue tolerant only at 3 to 16 fl oz per acre, so at Roundup’s spray-to-wet rate treat every lawn grass as a target. Picking a lawn-safe weed killer by grass type is covered in our lawn weed killer guide.

How long does Roundup take to kill grass?

1. Super Concentrate (glyphosate)4
2. Concentrate Plus (glyphosate, diquat)0.50
3. Weed & Grass Killer40.25
4. Super Concentrate20.25
5. Max Control 3650.50
6. For Lawns Southern3

Source: EPA master labels 71995-25, 71995-29, 71995-65, 71995-72, 71995-49 and 2217-1010; For Lawns first symptoms from roundup.com (2 to 3 days) Annual weeds and grasses; perennials can take 4 or more weeks on the same labels. Hours converted to days (6 hours = 0.25).

Show the numbers

	First symptoms, days	Complete kill, days
Super Concentrate (glyphosate)	4	14
Concentrate Plus (glyphosate, diquat)	0.50	14
Weed & Grass Killer4	0.25	14
Super Concentrate2	0.25	14
Max Control 365	0.50	14
For Lawns Southern	3	28

Glyphosate is the slow one on the surface: 71995-25 promises yellowing in 2 to 4 days and complete kill in 1 to 2 weeks, faster above 60°F in sun. The diquat in Concentrate Plus and the fluazifop formulas browns leaves in 3 to 12 hours, but the roots still take 1 to 2 weeks, and the labels allow 4 or more weeks for perennials.

Bermudagrass, zoysia and quackgrass come back from rhizomes the spray never reached. The 71995-25 lawn-replacement directions say to reapply if green patches remain after 7 days; the fluazifop labels (71995-64, 71995-72) require 28 days before a repeat. For a full bermuda removal plan, see how to kill bermuda grass.

How much Roundup per gallon kills grass?

Every Roundup concentrate sprays 1 gallon of mix over 300 sq ft. Super Concentrate uses 2.5 fl oz (5 tablespoons) per gallon for lawn grass and perennials, Concentrate Plus and Weed & Grass Killer4 Concentrate 6 fl oz, and Super Concentrate2 3 fl oz.

Area to spray (sq ft)Coverage1 gallon of mix per 300 sq ft (all four labels)Product and rateSuper Concentrate 71995-25, lawn grass rate, 2.5 fl oz per galSuper Concentrate 71995-25, annual weeds, 1.5 fl oz per galConcentrate Plus 71995-29, 6 fl oz per galWeed & Grass Killer4 Concentrate 71995-64, 6 fl oz per galSuper Concentrate2 71995-72, 3 fl oz per galApplications1 spray2 sprays (rhizome grasses: bermuda, zoysia)

Concentrate to measure (fl oz)

8.3

Same amount in tablespoons

17

Each label sprays 1 gallon of mix over 300 sq ft, so 1,000 sq ft takes about 3.3 gallons of mix. Default: 1,000 sq ft at 2.5 fl oz per gal = 8.3 fl oz (17 tablespoons). 1 fl oz = 2 tablespoons. Fluazifop labels require 28 days between sprays.

Product and use	Label rate	Active per gallon of product	Arithmetic (145.2 = 43,560 / 300 sq ft)	Active per acre
Roundup Super Concentrate, lawn replacement (71995-25)	2.5 fl oz per gal, 1 gal per 300 sq ft	3.7 lb glyphosate per gal	2.5 / 128 x 3.7 x 145.2	10.5 lb glyphosate per acre
Roundup Concentrate Plus (71995-29)	6 fl oz per gal, 1 gal per 300 sq ft	1.2 lb glyphosate per gal	6 / 128 x 1.2 x 145.2	8.2 lb glyphosate per acre
Roundup Pro Concentrate, perennial weeds, broadcast (524-529)	1.6 to 4 quarts per acre	3.7 lb glyphosate per gal	0.4 to 1 gal x 3.7	1.5 to 3.7 lb glyphosate per acre
Virginia Tech, low rate over dormant bermuda (Askew)	20 fl oz Roundup Pro Concentrate per acre	3.7 lb glyphosate per gal	20 / 128 x 3.7	0.58 lb glyphosate per acre
Roundup Weed & Grass Killer4 Concentrate (71995-64)	6 fl oz per gal, 1 gal per 300 sq ft	0.17 lb fluazifop per gal	6 / 128 x 0.17 x 145.2	1.16 lb fluazifop per acre
Roundup Super Concentrate2 (71995-72)	3 fl oz per gal, 1 gal per 300 sq ft	0.31 lb fluazifop per gal	3 / 128 x 0.31 x 145.2	1.05 lb fluazifop per acre
Fusilade II, over tall fescue to suppress bermuda (100-1084)	5 to 6 fl oz per acre	2 lb fluazifop per gal	5 to 6 / 128 x 2	0.08 to 0.09 lb fluazifop per acre
Fusilade II, over zoysia (100-1084)	3 to 4 fl oz per acre	2 lb fluazifop per gal	3 to 4 / 128 x 2	0.05 to 0.06 lb fluazifop per acre

A homeowner gallon of Super Concentrate over 300 sq ft works out to 10.5 lb of glyphosate per acre, about 18 times the 0.58 lb Virginia Tech’s Shawn Askew sprays over dormant bermuda to kill winter weeds. He puts the green-up delay from 40 fl oz per acre at 6 weeks or more when the bermuda was not fully dormant. To kill a whole lawn and reseed, follow our guide to killing grass before replanting.

Why is Roundup not killing my grass?

1. Check the active ingredient. A For Lawns bottle (2217-917, 2217-1009) is built to spare turf, and Weed & Grass Killer4 kills grass through fluazifop and triclopyr, with perennials taking 4 or more weeks (71995-65).
2. Check the rain. Glyphosate needs 30 minutes dry on 71995-25; For Lawns needs 3 to 4 hours.
3. Check the weather and the grass. 71995-25 works best above 60°F in sun and says results slow in cool or cloudy weather. Labels say to spray actively growing plants; Virginia Tech sprays low rates over dormant bermuda because brown, dormant grass takes up little.
4. Check the rate. 1.5 fl oz per gallon is the annual-weed rate; lawn grass and perennials need 2.5 fl oz (71995-25). Virginia Tech also notes glyphosate is sensitive to hard water and suggests ammonium sulfate as a conditioner (Askew).
5. Check for rhizomes. Bermuda and zoysia regrow from underground stems; respray green regrowth after 7 days on glyphosate or 28 days on fluazifop formulas.

Sprayed the wrong Roundup on your lawn?

1. 1Does the front panel say Roundup For Lawns?

   YesFind your grass in the matrix above. Northern bottles (2217-917, 2217-918) bar St. Augustine, bahia, centipede, bentgrass and carpetgrass; Southern bottles (2217-1009, 2217-1010) allow St. Augustine at 50 to 85°F. Listed grasses may yellow briefly.

   NoGo to the next question

2. 2Is it For Lawns Crabgrass Destroyer (topramezone)?

   YesIt is labeled only for Kentucky bluegrass, tall and fine fescue and perennial ryegrass; bermuda, zoysia, St. Augustine, bahia, buffalograss, seashore paspalum, bentgrass and carpetgrass are on its do-not-apply list.

   NoGo to the next question

3. 3Is the spray still wet on the grass?

   YesRinse the grass with a hose now, or cut off the treated blades: the 71995-25 and 71995-64 labels give that instruction for accidentally sprayed plants.

   NoGo to the next question

4. 4Does the bottle say Max Control 365, Extended Control or Dual Action?

   YesExpect the grass to die and nothing to grow there for 4 to 12 months: imazapic stays in the soil. Do not reseed before the label's wait.

   NoWeed & Grass Killer formulas kill treated grass in 1 to 2 weeks. Mark the patch, wait 3 days (glyphosate only) or 7 days (fluazifop formulas), then reseed or sod.

Source: EPA labels 71995-25, 71995-64, 71995-49, 2217-917, 2217-1010 and 71995-70; 4-month waits from our Roundup soil table (71995-66, 71995-69)

Act within minutes. Both 71995-25 and 71995-64 tell you to rinse accidentally sprayed plants with water immediately or cut off the treated area. A Northern For Lawns bottle on St. Augustine or centipede was used against its label’s do-not-use line, the mix-up Ohio State Extension warns about. Neither label gives a recovery timeline; judge after the kill window: 2 weeks for Weed & Grass Killer, up to 4 weeks for Southern For Lawns. Patches that stay brown need reseeding, sodding or revival steps after the label’s planting wait.

This page is general information, not pesticide advice. The label is the law: read the container you bought, because master labels carry bracketed options and your bottle prints one of them.