The best roundup weed killers, compared.
Top pick: Roundup Pump 'N Go refill Best value: Roundup Path – Lowest ready-to-use shelf price in the set, £8.84, with 4.4 from 5,808 reviews and coverage listed up to 30 m². Updated October 2026.
Roundup weed killer, on this page, means amateur garden weedkillers sold under the Roundup name on amazon.co.uk. It is not every weedkiller, and it is not a professional farm pack. You are choosing a job: a few patio weeds, a long drive, woody growth, or a stump that is reshooting. Glyphosate lines are sold as systemic root killers. Total Optima is glyphosate-free pelargonic acid: faster to see, and not marked as systemic on the brand's own grid. A ready-to-use trigger is the honest pack for a small area. A concentrate is cheaper only if you measure it and spray the ground it covers. A 5 litre Pump 'N Go refill only helps if the old sprayer still opens. Shelf prices here run from £8.84 for the Path bottle to £52.66 for the Tough concentrate. The top pick is Roundup Total Fast Action, two 1 litre sprays at £12.98, with 4.4 from 17,077 reviews. The best value is Roundup Path at £8.84, with 4.4 from 5,808 reviews and coverage listed up to 30 m². Format, chemistry and coverage are set out in the [Roundup weed killer buying guide](/hub/weed-control/roundup-weed-killer/sub/roundup-weed-killer-buying-guide).
Roundup weed killer, on this page, means amateur garden weedkillers sold under the Roundup name on amazon.co.uk. It is not every weedkiller, and it is not a professional farm pack.
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Personal buying guide
Question 1 of 2
Which chemistry do you want?
The listing is a 5 litre refill at £25.99 for a Fast Action Pump 'N Go sprayer, glyphosate, systemic, results claimed in 1–2 days, 4.6 from 7,749 reviews. It is not a complete sprayer. Reviews describe paths, driveways and fence lines dying within a week when poured into a working Pump 'N Go. One buyer could not unscrew the cap on an old pump. No square-metre figure is in the raw file.
Pros
Cons
Best for: Someone who already owns a Pump 'N Go sprayer and wants 5 litres of Fast Action refill.
Less suitable: A first bottle, if you have no sprayer, or block-paving gaps one reviewer could not clear.
Specifications
Common questions
Is the sprayer in the box?
The listing calls this a refill for a Fast Action Pump 'N Go. It does not say a sprayer is included. One review could not unscrew the cap on an existing pump.
What active ingredient is listed?
Glyphosate. The bullets also say it is systemic, kills the root, and shows results in 1–2 days, with up to 3 minutes of continuous spraying.
Does the listing say it is child safe?
The page asks that as a prompt. No yes or no answer is stored in the raw file, and this listing has no once-dry bullet.
The scraped page is £21.89 for a 1 litre Optima+ concentrate, model 120035, coverage 810 m², 4.5 from 2,988 reviews. The URL ASIN is B01BY4FOB0 and the specification block prints B01BY4FFEQ. The title also contains the words camping pouch, nylon and tan. The active cell says ferrous sulphate. Bullets claim a root kill and say children and pets need not be excluded once the spray is dry. Reviews describe bindweed, brambles and a gravel drive, with a week or two before the full effect.
Pros
Cons
Best for: A large area if you accept the listing's coverage figure and can confirm the bottle in your hand matches Optima+.
Less suitable: A buyer who needs one clean ASIN, or a ready-to-use trigger.
Specifications
Common questions
Which ASIN is on the page?
The product URL is amazon.co.uk/dp/B01BY4FOB0. The specification block prints ASIN B01BY4FFEQ. The title line also includes the words camping pouch, nylon and tan.
What coverage does the listing claim?
The bullet says coverage of 810 m² from this concentrate, and that it kills roots so weeds do not come back.
How long did reviewers wait?
Reviews describe up to a week for bindweed and brambles, and up to two weeks for deep-rooted weeds in paving. One review says autumn and winter are slower.
The listing is two 1 litre ready-to-use sprays at £16.98. The bullet says glyphosate-free, pelargonic acid, visible results in 3 hours, and replanting in 3 days, for flower beds, borders and vegetable patches. amazon.co.uk shows 4.5 from 395 reviews. Reviews describe fast scorch on block paving, a nozzle that wastes spray, and a doubt that roots are fully killed. Overspray marked grass, which one reviewer said recovered.
Pros
Cons
Best for: A glyphosate-free ready-to-use spray for beds, borders or slab gaps, if a fast scorch is enough.
Less suitable: A buyer who needs a systemic root kill, or a measured coverage area.
Specifications
Common questions
Is this the glyphosate-free Roundup?
The bullet says glyphosate-free, with pelargonic acid as the listed active, visible results in 3 hours, and replanting 3 days after application.
Can it be used on a patio?
The bullets name flower beds, borders and vegetable patches. Reviews in the raw file describe patio, driveway and block-paving use. A patio prompt on the page has no stored answer.
Does it kill the root?
The bullets do not say it kills the root. A review of this non-glyphosate spray says it might not fully destroy the root.
The listing is a pack of two 1 litre ready-to-use sprays at £12.98, active ingredient glyphosate, with visible results claimed in 1–2 days. amazon.co.uk shows 4.4 from 17,077 reviews and rank 1 in Weed Killers. Bullets say children and pets need not be kept off once the spray is dry, and that you should treat the weed only. Reviews describe patio and driveway gaps dying in about a week, a slight sprayer leak, and the same patches starting again within weeks. In this set it is the top pick for a small ready-to-use job, not for a lawn you want to keep.
Pros
Cons
Best for: Weeds in patio joints and along a driveway, if you want a ready-to-use glyphosate spray and will treat the weed only.
Less suitable: A lawn you want to keep, a long drive that needs tens of litres, or a glyphosate-free brief.
Specifications
Common questions
How soon does the listing say weeds show results?
The bullets say visible results in 1–2 days. A stored review describes wilting within a couple of days and most weeds dead after about a week.
Will it leave nearby plants alone?
The listing says the product should be applied to the weed only. A review calls it non-selective and says it damages grass and other plants if they are sprayed.
Do children and pets have to stay off the area?
The bullet says children and pets need not be excluded from treated areas once the spray is dry. A review also says the sprayer can leak slightly.
The listing is a 250 ml super concentrate at £13.99, claimed to treat up to 16 stumps, plus brambles, nettles, woody weeds and Japanese knotweed. amazon.co.uk shows 4.4 from 6,559 reviews. The active-ingredient cell says ferrous sulphate, which the bullets do not explain. A review of drilled conifer and shrub stumps says regrowth stopped and the wood did not rot out. A review says keep animals away.
Pros
Cons
Best for: Cut stumps you can drill, if stopping regrowth is the job.
Less suitable: Rotting a stump out, a patio trigger job, or Japanese knotweed you plan to treat yourself.
Specifications
Common questions
Does it rot the stump out?
A review of two conifer stumps and three shrub stumps says drilled holes and two applications stopped further growth, and the wood was still solid about nine months later.
What active ingredient does Amazon list?
The specification cell says ferrous sulphate. The bullets describe a stump and woody-weed killer and do not repeat that name.
Does the listing mention Japanese knotweed?
Yes, the bullet names Japanese knotweed alongside stumps, brambles and nettles. The raw file does not give a home treatment method.
The listing is a 1 litre ready-to-use spray at £8.84 for paths, patios and drives, with coverage up to 30 m² and results claimed in 1–2 days. amazon.co.uk shows 4.4 from 5,808 reviews. The specification cell lists the active ingredient as green, which is not a chemical name. Reviews describe weeds between slabs and a blocked rain drain dying, a sprayer clip that would not turn, and white marks on the drive. In this set it is the best value ready-to-use bottle on shelf price.
Pros
Cons
Best for: A short path or patio, up to the listed 30 m², if you want one ready-to-use bottle.
Less suitable: Anyone who needs a named active ingredient on the Amazon cell, or a drive much larger than 30 m².
Specifications
Common questions
Where does the listing say to use it?
The bullets say it is ideal for weeds on paths, patios and drives, with coverage of up to 30 m². A gravel question is on the page as a prompt, without a stored answer.
Does it stain paving?
More than one review says it leaves white marks on a driveway. One review says a few hours of heavy rain washed the stains off.
Do weeds stay gone?
The bullet says it kills the root so weeds do not come back. A review says weeds started coming back after a few weeks, and another says larger weeds need a repeat.
The listing is two 1 litre ready-to-use sprays at £15.16, with a root-kill bullet, brambles, thistles and nettles, results in 1–2 days, and coverage of 30 m². amazon.co.uk shows 4.4 from 5,095 reviews. The active-ingredient cell says ferrous sulphate. Reviews include a dead weed in 24 hours or in 3–5 days, a nozzle that only jets, white marks on a drive, and bindweed that survived.
Pros
Cons
Best for: Tough weeds on a small area, about the listed 30 m², with a ready-to-use bottle.
Less suitable: A buyer who needs the Amazon active cell to name glyphosate, or ivy you expect to brown in a day.
Specifications
Common questions
Which weeds do the bullets name?
Brambles, thistles, nettles and other deep-rooted and woody weeds, with coverage of 30 m² and results visible in 1–2 days.
What does the active-ingredient line say?
The specification cell says ferrous sulphate. The bullets do not use that name.
Can children and pets use the area afterwards?
The bullet says children and pets need not be excluded once the spray is dry. A review says wear gloves, cover legs and feet, and do not inhale it.
The listing is a 1 litre glyphosate concentrate at £52.66, model 120047, made in the United Kingdom on the listing, claimed to make up to 100 litres and cover 3,000 m². amazon.co.uk shows 4.4 from 1,541 reviews. Bullets say children and pets need not be excluded once the spray is dry. Reviews split between a week-later kill on paths and a 7–10 day result that one buyer found weaker than ready-mixed Roundup, including at double strength.
Pros
Cons
Best for: A large area you will dilute yourself, if the 3,000 m² figure matches the rate on the label you read.
Less suitable: A small patio, or anyone who wants a result in two days without measuring.
Specifications
Common questions
How much spray does 1 litre make?
The title says it makes up to 100 litres. The coverage line says 3,000 m². One review describes a 1:100 dilution.
Can children and pets go back on the area?
The bullet says children and pets need not be excluded from treated areas once the spray is dry.
How long did reviewers wait?
One review saw nothing at first and a clear patio a week later. Another says ready-mixed Roundup was faster, and that this concentrate took 7 to 10 days and stayed weak even when mixed at double strength.
The listing is a 500 ml concentrate at £29.99, glyphosate, described as systemic for perennial, tough, deep-rooted and woody weeds. amazon.co.uk shows 4.4 from 724 reviews. No sprayer is listed. A review of ivy, bamboo and honeysuckle saw little change at two weeks and collapse in the third week. Another says rhizome weeds took months.
Pros
Cons
Best for: Woody and deep-rooted weeds if you will mix a concentrate and wait weeks, not hours.
Less suitable: A same-weekend patio tidy, or a buyer who does not want to dilute.
Specifications
Common questions
What does the listing say it kills?
The bullets say a super concentrated systemic weedkiller for tough weeds, to the roots, and the coverage line says most perennial, tough, deep-rooted, woody weeds. It says it contains glyphosate.
How fast did woody weeds die in reviews?
One review of ivy, bamboo and honeysuckle saw little change at two weeks and a clear kill by the third week. Another says rhizome weeds took months.
Is a sprayer included?
No sprayer is listed. The item form is liquid concentrate, 500 ml.
The listing is a 5 litre pump spray at £29.98, pelargonic acid, glyphosate-free, coverage 165 m², results claimed in 3 hours, replanting in 3 days. amazon.co.uk shows 4.4 from 165 reviews. Bullets name flower beds, borders, vegetable patches, clover, chickweed, groundsel, black medick and annual meadow-grass. One review says the pump handle arrived broken. Another says thick weeds were not cleared.
Pros
Cons
Best for: A larger glyphosate-free clear-up of beds or patches, about the listed 165 m², if the pump works.
Less suitable: Thick woody weeds, or anyone who needs a high review count.
Specifications
Common questions
Is the 5 litre Optima glyphosate-free?
Yes. The bullet says glyphosate-free and ready to use, with pelargonic acid as the listed active, visible results in 3 hours, and replanting in 3 days.
What area does it claim?
The specification coverage is 165 m². The bullets name flower beds, borders and vegetable patches, plus clover, chickweed, common groundsel, black medick and annual meadow-grass.
Did the pump arrive working?
One review says the plastic pump handle was broken. Other reviews describe the pump and lance as easy to use when intact.
The listing is a 3 litre ready-to-use pack at £23.89, glyphosate, coverage up to 90 m², for brambles, thistles, nettles and other deep-rooted weeds. amazon.co.uk shows 4.2 from 2,274 reviews, the lowest star line in this set. One review says the sprayer gun and pipe were missing. Another says it killed red sorrel and the grass around it.
Pros
Cons
Best for: A larger ready-to-use area, about the listed 90 m², including woody weeds, if the lance is in the box.
Less suitable: A lawn you want to keep, or a buyer who cannot return a pack that arrives without a gun.
Specifications
Common questions
How much ground does the listing claim?
The bullet says a 3 litre ready-to-use pack for larger areas, up to 90 square metres, and names brambles, thistles, nettles and other deep-rooted and woody weeds.
Does the box include a sprayer?
The listing calls it a ready-to-use spray. One review says the liquid arrived without the sprayer gun and pipe.
Can it be used on a lawn?
A review used it on red sorrel in a lawn and says it kills grass as well. The listing does not describe a selective lawn weedkiller.
Eleven Roundup weed killers on amazon.co.uk were scored from the listing star line and review notes, not from a laboratory kill test. The base is the star average times 20, so 4.4 stars is 88 before damping. Counts under about 500 are damped. Points then come off for a listing conflict, such as an active-ingredient cell that says ferrous sulphate or green, or two ASINs on one page, and for repeated review faults such as a leak, a missing lance, a broken pump, white marks, regrowth, or a root-kill the bullets do not make. Price does not raise the score. Price decides only the best-value badge.
Amazon stars
50%The amazon.co.uk star average, times 20, is the base. A 4.4 becomes 88 before any damping. The star line on each product stays the UK listing figure.
Review volume
25%Counts under about 500 are damped, so a 4.5 from a few hundred reviews does not outrank a 4.4 from many thousands.
Listing and review faults
25%Points come off for a conflicting active-ingredient cell, two ASINs on one page, and repeated review faults such as a leak, a missing lance, white marks or regrowth.
Start with the chemistry, then the job and the surface, then the pack, then the coverage figure against the bottle in your hand. Price comes after those. The notes below follow that order for these eleven amazon.co.uk listings. None of the scores is a laboratory kill test.
A Roundup weed killer in this set is an amateur garden product sold under the Roundup name on amazon.co.uk, made for Evergreen Garden Care. It is not every weedkiller on the site, and it is not a professional farm pack. You are choosing a job: a few patio weeds, a long drive, woody growth, or a stump that is reshooting. Quality is the match between the chemistry and that job. Chemistry comes first.
Total Optima is pelargonic acid. The brand grid does not mark it as systemic. Visible results are claimed in 3 hours, and a review doubts that the root is killed. Regrowth from the root is the trade you accept.
Path and the Tough twin list about 30 m². The 3 litre Tough lists up to 90 m². A concentrate is only cheaper if you measure it and spray the ground it covers. The 3,000 m² line is the listing's upper figure.
Several specification cells say ferrous sulphate or green. Love the Garden's ingredient page does not. Read the bottle. Do not treat that Amazon cell as the formula when the manufacturer list conflicts.
Glyphosate is the chemistry behind the brand's kills-to-the-root claim on Fast Action, Path, Tough, Ultra, Optima+ and the stump killer, as the manufacturer ingredient list sets them out. Total Optima is the glyphosate-free line: pelargonic acid, a scorch claimed in about 3 hours, replanting in about 3 days, and no systemic mark on the brand grid. A review of the Optima spray doubts that the root is fully killed. Match the bottle to the surface.
Ready to use is the honest pack if you will not measure: Fast Action at £12.98, Path at £8.84, Tough twin at £15.16, Optima twin at £16.98, and the 3 litre Tough at £23.89 for a listed 90 m². A concentrate suits a large area only if you have a sprayer. Ultra is 500 ml at £29.99 with no sprayer listed. Tough concentrate is £52.66 and claims up to 100 litres and 3,000 m². Optima+ claims 810 m², and its URL ASIN does not match the specification ASIN.
Three typical situations, each with a recommendation from this comparison.
You have weeds in joints or along a short drive and you will not dilute a concentrate. Roundup Total Fast Action is two 1 litre ready-to-use glyphosate sprays at £12.98, with 4.4 from 17,077 reviews. Treat the weed only. It is not a lawn weedkiller.
You already have a sprayer and the ground is bigger than a 30 m² trigger bottle. Roundup Tough concentrate is 1 litre of glyphosate at £52.66, listed as making up to 100 litres and covering 3,000 m². Those figures are the listing's upper claims, not a measured drive.
You want pelargonic acid rather than glyphosate, and a fast scorch is enough. Roundup Total Optima is two 1 litre sprays at £16.98, with results claimed in 3 hours and replanting in 3 days. The bullets do not say it kills the root.
In this set of eleven amazon.co.uk listings, the top pick is Roundup Total Fast Action. It is £12.98 for two 1 litre ready-to-use glyphosate sprays, 4.4 from 17,077 reviews, and rank 1 in Weed Killers. Reviews still report a slight sprayer leak and regrowth in the same patches within weeks. The best value is Roundup Path at £8.84, 4.4 from 5,808 reviews, with coverage listed up to 30 m². Its Amazon active-ingredient cell says only green, and reviews mention white marks and a stiff sprayer clip. The other nine have no award. None of these scores is a laboratory kill test.
Roundup Path
Lowest ready-to-use shelf price in the set, £8.84, with 4.4 from 5,808 reviews and coverage listed up to 30 m².
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Public UK sources from the research digest, last checked on 17 October 2026. Shelf prices and star lines are the amazon.co.uk figures in the display file. Coverage figures are listing claims, not a test run for this page.
This page contains affiliate links to amazon.co.uk. If you buy through them, we may earn a commission at no extra cost to you. Prices, stars and review counts are from the UK listings checked on 17 October 2026. We did not lab-test these weed killers.
