Doff weed killer: what is in every bottle, and the number missing from all of them
Doff are the one brand on the shelf you cannot do the arithmetic on. Not one of their four concentrates publishes a millilitres-per-litre-of-water rate on their website, so you cannot work out what goes in a sprayer or what a litre of made-up spray costs. Here is every Doff weedkiller at its real strength, the sum their own coverage figures let you do instead, and where the missing rate actually lives.
By The Weed GuyLast updated
The short version
The Doff concentrates are ordinary amateur glyphosate: three at 90 g/L and Power Up 360 at 360 g/L, which is the legal ceiling for anyone without a certificate. Doff 24/7 is not glyphosate at all, it is 31.02 g/L pelargonic acid, and it burns the leaf without touching the root. The problem is the paperwork. Doff express dose as product per square metre of ground and never as product per litre of water, on any product page or safety data sheet, so the one number you need at the sprayer is not there. It is on the pack label, and I found exactly one retailer in the country reproducing it: 80ml of the sachet into 800ml of clean water, for the 90 g/L products only.
Every Doff concentrate, and the column that stays empty
The third column is what each manufacturer publishes. The fourth is my own arithmetic, worked from their published figures: how many grams of glyphosate their own numbers put on a square metre of ground. That is the only currency these bottles can be compared in, because Doff give no water volume to compare on.
| Product | Strength | Maker's rate per litre of water | Glyphosate per sq m of ground |
|---|---|---|---|
| Doff Advanced Concentrated Weedkiller, 1 litre | 90 g/L glyphosate | Not published | 0.225 g, from "1 litre bottle treats up to 400sqm" |
| Doff Path and Patio Weedkiller Concentrate, 3 x 80ml | 90 g/L glyphosate | Not published | 0.225 g, from "each sachet can treat areas up to 32sqm" |
| Doff Power Up Concentrated Weedkiller 90, 100ml sachets | 90 g/L glyphosate | Not published | 0.225 g, from "each sachet will cover up to 40 sq.m" |
| Doff Power Up Concentrated Weedkiller 360, 250ml | 360 g/L glyphosate | Not published | 0.225 g, from "makes up to 10 litres" over "up to 400m2" |
| Gallup Home & Garden, 1 litre | 360 g/L glyphosate | 24 ml | 0.216 g |
| Roundup Ultra concentrate | 360 g/L glyphosate | 10 ml annual, 15 ml perennial | 0.12 g to 0.18 g |
| Roundup Optima+, 1 litre | 170 g/L glyphosate | About 20 ml | 0.113 g |
| Weedol Rootkill Plus, 500ml | 120 g/L glyphosate with pyraflufen-ethyl | 17 ml | 0.102 g |
Doff 24/7 and the ready-to-use Doff Path and Patio trigger bottle are not in the table because a pre-mixed bottle needs no dilution rate and it would be unfair to mark them absent. The four above are all sold as concentrates you dilute yourself. The comparison rows are the published label figures already worked through on the glyphosate concentrate strengths and mixing rates resource.
The number Doff do not print, and why it stops you dead
Stand at a tap with a 5 litre pressure sprayer and a bottle of concentrate. The only question you have is how much goes in. Every rival answers it the same way, in millilitres of product per litre of water, because that is the shape of the question. Gallup Home and Garden says 24 ml. Roundup Ultra says 10 ml for annual weeds and 15 ml for perennials. Weedol Rootkill Plus says 17 ml into a litre.
Doff answer a different question. Their pages give a maximum dose per square metre of ground and a coverage figure per pack, and stop. Across all six Doff weedkiller product pages and the safety data sheets behind them, there is no millilitres-per-litre figure. The Path and Patio sachets are described as "80ml sachets to be diluted at home" with no statement of what to dilute them into.
That is not a small omission, because a square metre of drive is not a thing you can pour into. You are holding a volume of water, not an area. Product per square metre only becomes usable once you know how much ground one tankful is meant to cover, and that is the very figure Doff leave out.
The second casualty is money. Comparing weedkiller honestly means working out what a litre of made-up spray costs, and you cannot get there without the tank rate. So Doff sit outside every price comparison anyone tries to run, which is a strange place for a supermarket-shelf brand to end up. The general trap that sets, of a yield claim standing in for a rate, is worked through on the concentrate versus ready to use resource.
What Doff's numbers do tell you: the same answer, four times over
Here is the part that surprised me, and it is why this page is not a hatchet job. Doff's dose model is coherent. It is just written in the wrong units.
Take the coverage figure off each pack and turn it into grams of glyphosate per square metre of ground. A 1 litre bottle of Advanced Concentrated over 400 square metres is 2.5 ml per square metre, and at 90 g/L that is 0.225 grams. An 80ml Path and Patio sachet over 32 square metres: 0.225 grams. A 100ml Power Up 90 sachet over 40 square metres: 0.225 grams. And the 250ml Power Up 360, four times the strength over the same 400 square metres, works out at 0.225 grams as well.
Four products, two strengths, three pack formats, one identical answer to three decimal places. Somebody at Doff has done this properly. They have simply published the half of it that suits a marketing bullet rather than the half you need at a sprayer.
It is also worth knowing where that lands. Gallup Home and Garden's own label rate works out at 0.216 grams a square metre, so Doff are pitching at essentially the same loading as the strongest amateur bottle on the market. Roundup Ultra at its annual-weed rate is 0.12 grams, and Roundup Optima+ is 0.113. Doff are not a weak product dressed up. On their own published figures they put nearly twice as much glyphosate on the ground as a Roundup concentrate mixed for annual weeds.
The rate does exist. It is on the pack, and almost nowhere else
I went looking for it properly rather than settling for the complaint, and it turned up in one place: a trade garden supplier that reproduces the full pack label on its listing for the 12-sachet box of Doff Advanced Concentrated. The line reads, word for word, "Garden sprayer: Pour the contents of the 80ml sachet into 800ml of clean water and agitate after closing", and then "Diluted solution will treat 32sqm."
So it is one part concentrate to ten parts water, which is 100 ml of concentrate per litre of water. Two caveats before anyone reaches for a measuring jug. That is the 80ml sachet of the 90 g/L product, not the 360 g/L Power Up. And the pack you have bought is the legal document, so the instructions on it beat this page, this website and Doff's own marketing copy.
Now check it against the arithmetic above, because it closes the loop exactly. 80ml over 32 square metres is the same 2.5 ml per square metre, the same 0.225 grams of glyphosate. The made-up sachet gives 880ml of spray over 32 square metres, so about 27.5ml of liquid a square metre, which is a sensible fine spray rather than a soaking. And 100 ml per litre of a 90 g/L concentrate puts 9 grams of glyphosate in your tank, against Gallup Home and Garden's 24 ml per litre of a 360 g/L concentrate at 8.64 grams. Every figure Doff publish is consistent with every other one. They simply do not publish the one that turns the rest into an instruction.
With the rate in hand the sum I said you could not do becomes possible. The 12-sachet box was listed at twelve pounds when I looked in August 2026. That is 960ml of concentrate making a bit over ten litres of spray and covering around 384 square metres, so roughly one pound fourteen a litre of made-up spray and about three pence a square metre. Perfectly ordinary. Nobody should have needed to dig for a pack label to work it out.
One warning that matters more than the rest of this page. There is content circulating that quotes a Doff dilution ratio and attaches it to the Maxi Strength name, which is the 360 g/L product. The 1 to 10 ratio belongs to the 90 g/L sachets. Using it on a bottle four times the strength is four times the dose, and the same source also offers a "standard" ratio that appears on no Doff label I could find. Match the rate to the grams per litre printed on the bottle in your hand, every single time, the way the mixing rates resource sets out.
The one Doff figure that cannot be right on both bottles
There is a second line on the Doff pages, and it is where the coherence breaks. Both the 90 g/L Advanced Concentrated and the 360 g/L Power Up carry the identical sentence: "Maximum dose rate is 2.4ml per 1 sq. m (before dilution)".
Word for word the same, on two products a fourfold difference in strength apart. A dose expressed as millilitres of product cannot mean the same thing on both. On the 90 g/L bottle, 2.4 ml a square metre is 0.216 grams of glyphosate. On the 360 g/L bottle the same 2.4 ml is 0.864 grams, close to four times Doff's own coverage figure for that very product. One of those two numbers on the Power Up 360 page is wrong, and there is nothing on the page to tell a reader which.
There is a smaller wrinkle on the 90 g/L bottle too. "1 litre bottle treats up to 400sqm" works out at 2.5 ml a square metre, which is fractionally over the 2.4 ml maximum printed a line above it. To stay inside its own stated maximum, a litre would have to cover about 417 square metres. That one is rounding rather than scandal, and I mention it only because it shows these figures were written to fill a bullet list, not to be worked from.
None of this makes the product dangerous. Amateur glyphosate has a wide margin and 360 g/L is a legal, approved, everyday strength, as the strongest weed killer resource sets out. It makes the published information unusable, which is a different complaint and a fair one.
The second gap: when children and pets can go back on
This one matters more to most people than any mixing rate, and Doff's website does not answer it either. I looked across every Doff weedkiller page and read the Advanced Concentrated safety data sheet end to end. There is no sentence in any of it telling you when a child or a dog can walk on ground you have just sprayed.
What the safety data sheet carries is the standard precautionary statement, "Keep out of reach of children", which is about the bottle in the shed rather than the ground outside. The Doff 24/7 sheet adds "Keep away from domestic animals" in the same breath, again about storage.
The closest Doff get is one line on the Power Up 90 page: "Avoid transfer to lawns by allowing the treated area to dry before walking on it." Read the reason given. Letting it dry is presented as protecting your grass from herbicide carried on your shoes, not as protecting the person wearing them. That is not a criticism of the chemistry, it is an observation about who the sentence was written for.
Compare it with the rest of the shelf. Roundup, Weedol and Resolva all print, word for word, "keep children and pets away from treated areas until spray has dried", and they print it identically whether the bottle is glyphosate, acetic acid or one of the natural fatty acids. The standard is settled and universal, and Doff's website is where it goes missing. Apply it anyway: dried is the trigger, and how long that actually takes depends far more on the weather than on the brand. The wider question sits on whether weed killer is safe for pets and children.
Doff 24/7: the fastest bottle Doff sell, and the one that finishes nothing
Doff 24/7 Fast Acting is the product most people mean when they search the brand, and it is the one where expectation and mechanism part company. It is 31.02 g/L pelargonic acid, a fatty acid, and Doff are upfront that it is a "non-Glyphosate formulation" that controls weeds "upon contact".
Contact is the whole story. Pelargonic acid wrecks the leaf tissue it lands on and is not carried anywhere else in the plant, so the promise of "Visual results within 24 hours" is true and the root under the paving is entirely untouched. Doff say so themselves without saying so: the bottle "can be applied several times during the season". A product that killed the plant would not need to be.
Two more things off that page worth having. Doff put the maximum dose at "100ml per 1 sq.m on a single weed", forty times the millilitres a square metre of the glyphosate products, which for a 1 litre bottle is a great deal less ground than people assume. And they state it is "Non-hazardous to bees", which is a real point in its favour and consistent with HSE recording the product as not classified at all: no pictogram, no signal word, no hazard statement.
So it is a decent tidy-up spray and a poor answer to a weed that keeps coming back. If what you want is brown by teatime before visitors arrive, it delivers. If you want the weed gone, you want something systemic, and the difference between the two is the whole argument of what the glyphosate-free bottles actually do.
So should you buy Doff?
Yes, with two conditions, and neither is about the chemistry. Buy the pack whose instructions you can read before you open it, and buy the strength that matches the ground you are treating. Power Up Concentrated 360 is 360 g/L glyphosate on a live amateur authorisation, the same active at the same loading as the concentrates everyone rates.
The surface point is the one people miss. HSE list hard surfaces among the approved areas for both 90 g/L products, Advanced Concentrated and Concentrated Path and Patio, and for Doff 24/7. They do not list hard surfaces for either 360 g/L product. So on a drive or a patio the strong bottle is not automatically the right bottle, and your pack is the thing to check before you assume otherwise.
The other condition is dosing. If you end up guessing a rate, an over-diluted tank is indistinguishable from a correct one right up to the fortnight later when nothing has died. Under-dosing is the commonest reason a spray disappoints, and it is the one mistake a printed rate makes impossible. The comparison worth making is with Gallup Home and Garden, which is the same 360 g/L in a plain bottle and prints 24 ml per litre of water and 40 square metres per litre of spray in black and white. It is not a better chemical. It is a better-documented one, and on this purchase that is the whole difference.
Whichever you buy, the surface decides more than the brand does. What works in a paving joint against what works on open ground is set out on the driveway and patio weed killer resource.
What I would buy instead
My complaint about the Doff bottles is the missing dose detail, not the chemistry. If you want a glyphosate concentrate whose label prints one rate you can actually work to, this is it.
What I’d use
Glyphosate concentrate, 360 g/L
Gallup Home & Garden Glyphosate Weedkiller (1 litre)
The one Gallup a homeowner can legally buy and use: a 1 litre glyphosate concentrate at 360 g/L, approved for home and garden use under MAPP 17672.
It is the same active, the same 360 g/L loading and the same isopropylamine salt as the professional Gallup XL, and its single label rate of 24 ml per litre of water is exactly the rate the professional labels reserve for perennial broad-leaved weeds. The difference between the two bottles is the authorisation printed on them, not the chemistry inside, and this is the side of that line you are allowed to stand on.
- Active ingredient
- Glyphosate, 360 g/L, as the isopropylamine salt
- Formulation
- Soluble concentrate you dilute yourself
- Approval
- MAPP 17672, labelled for use only as a home and garden weedkiller
- Mixing rate
- 24 ml per 1 litre of water, per the label
- Coverage
- 40 sq m per litre of made-up spray, so roughly 1,667 sq m per bottle
- Rainfast
- Rain within 6 hours may reduce effectiveness, per the label
- Size
- 1 litre of concentrate
Watch out for
- No measuring cap in the bottle. Check a cup arrives, or the dose is guesswork.
- One re-treatment a season, and it takes four weeks. Do not go again early.
- Not for lawns. It is non-selective and takes the grass too.
- Resellers dominate the listing, so check the label that arrives is Barclay.
- "Super strength" is keyword stacking. It is 360 g/L, same as professional Gallup XL.
That’s an affiliate link: buy through it and I earn a small commission at no extra cost to you. It doesn’t change what I recommend or what I say is wrong with it. More on how that works in the affiliate disclosure.
No brand pays for a mention here, and nothing on this page is a paid-for opinion. The card above is an affiliate link, so I earn a commission if you buy through it, at no extra cost to you. It buys no product a kinder write-up, which is why the watch-outs sit on the same card as the reasons to buy.
About this resource
I'm The Weed Guy, one bloke who is qualified to use professional weedkiller. Every Doff figure quoted here was read off Doff's own website in August 2026, out of their safety data sheets, or off the pack label as reproduced in full by a trade garden supplier, and every quoted phrase is verbatim so you can go and check it. The MAPP numbers, approval dates and approved areas come from HSE's amateur pesticides register, which anyone can search. The comparison rates for Gallup, Roundup and Weedol are those manufacturers' published label figures.
The grams-per-square-metre column is my arithmetic, not anybody's label claim, and it is shown so you can redo it: millilitres of product per square metre, multiplied by grams per litre, divided by a thousand. If I have got a sum wrong I would rather be told.
No dilution rate is quoted here that does not come from a document, because inventing a plausible one would be the single most harmful thing this page could do. No re-entry period, because Doff state none. One price only, the listing I actually looked at, with the month I looked. I have not tested these products against each other and I am not going to pretend otherwise, and the page that gets the ratio wrong is described rather than named, because sending traffic to it would be daft.
No brand pays for a mention on this website, and there are no product links on this page at all, deliberately: a buy button sitting next to a complaint about missing dose information would be the wrong shape entirely. The site's full commercial position is on the affiliate disclosure page.
Common questions
How much Doff weed killer do I put in a litre of water?
Doff do not tell you, and the answer has to come off the pack. None of the six Doff weedkiller product pages or their safety data sheets states a millilitres-per-litre figure. The pack label does, and one trade garden retailer reproduces it in full for the 90 g/L sachets: "Pour the contents of the 80ml sachet into 800ml of clean water", which works out at 100 ml of concentrate per litre of water. That rate belongs to the 90 g/L products only. Doff sell a 360 g/L bottle under an adjacent name and using this rate on that one would be roughly four times the dose. Read the instructions on the pack in your hand before you measure anything.
What is the dilution rate for Doff Advanced Concentrated Weedkiller?
On Doff's own website, none is given. The page states "Contains 90g/l Glyphosate", "1 litre bottle treats up to 400sqm" and "Maximum dose rate is 2.4ml per 1 sq. m (before dilution)", and stops there. The safety data sheet adds nothing, because a safety data sheet covers hazards rather than application. The pack label carries the missing line, quoted by a trade retailer as 80ml of concentrate into 800ml of clean water, with the diluted solution treating 32 square metres. Check it against your own pack, because that quote is for the 80ml sachet format.
Does Doff weed killer contain glyphosate?
Most of the range does, and one well-known bottle does not. Doff Advanced Concentrated, Doff Path and Patio Weedkiller Concentrate and Power Up Concentrated 90 are all 90 g/L glyphosate. Power Up Concentrated 360 is 360 g/L, which is the strongest glyphosate liquid an amateur can legally buy in the UK. The ready-to-use Doff Path and Patio trigger bottle is 7.2 g/L glyphosate. Doff 24/7 Fast Acting is the odd one out: Doff describe it as a "non-Glyphosate formulation" and it is 31.02 g/L pelargonic acid, which behaves completely differently.
Is Doff 24/7 any good, and does it kill the roots?
It does exactly what a contact weedkiller does, which is not the same as what most buyers expect. Doff promise "Visual results within 24 hours" and that is a fair claim: pelargonic acid destroys the plant tissue it lands on and the weed browns fast. It is not carried down into the root, so a perennial with a taproot or a rhizome sends new growth up afterwards. Doff themselves say it "Controls a range of annual and perennial broad-leaved weeds and grasses upon contact" and that it "Can be applied several times during the season", which is the honest signature of a contact product. Buy it for a quick tidy-up, not to finish anything off.
How long before children and pets can go back on a Doff treated area?
Doff do not say on their website, and that gap is worth naming plainly. No Doff weedkiller page carries a re-entry sentence for children or pets, and neither does the Advanced Concentrated safety data sheet. The safety data sheet carries the storage-level "Keep out of reach of children" and nothing about treated ground. The nearest published line, on the Power Up 90 page, is "Avoid transfer to lawns by allowing the treated area to dry before walking on it", where the stated reason is protecting your grass. Roundup, Weedol and Resolva all print "keep children and pets away from treated areas until spray has dried". Apply that standard here: dried is the trigger, and your pack instructions beat any website.
What is the strongest Doff weed killer?
Doff Power Up Concentrated Weedkiller 360, at 360 g/L glyphosate, MAPP 19749. That is the strongest Doff and also the ceiling for the whole amateur shelf, the same loading as Roundup Ultra and Gallup Home and Garden. The register also lists Doff Advanced Maxi Strength Weedkiller at 360 g/L under MAPP 18103, though it has no page on Doff's website and looks to have been replaced by Power Up. One thing worth knowing before you reach for the strong one: HSE list hard surfaces among the approved areas for both 90 g/L products and do not list them for either 360 g/L product.
Is Power Up the same as Doff Advanced Concentrated?
Power Up Concentrated 90 and Doff Advanced Concentrated are both 90 g/L glyphosate, sold in different formats: sachets against a 1 litre bottle. Power Up Concentrated 360 is a different product at four times the strength, and it is the one people mix up. Sorting it out by the name on the front is harder than it should be, because Doff run "Advanced", "Power Up" and "Path and Patio" as overlapping labels across two glyphosate strengths and three formats. The reliable move works on any brand: read the grams per litre, then look the MAPP number up on the HSE garden register, which is the approach the strongest weed killer resource works through in full.
How much area does a bottle of Doff cover?
Doff are unusually consistent here, and it is the part of their labelling that works. A 1 litre bottle of Advanced Concentrated treats up to 400 square metres. An 80ml Path and Patio sachet treats up to 32 square metres. A 100ml Power Up 90 sachet covers up to 40 square metres. All three come out at the same 2.5 millilitres of product per square metre. The 250ml Power Up 360 covers the same 400 square metres from a quarter of the volume, which is exactly what four times the strength should do. Whatever else is missing, the coverage figures hang together.
How long does Doff weed killer take to work?
On the glyphosate products, Doff say weeds "may show first signs of treatment within a few days, but can take up to 4 weeks depending on weather conditions", and the Path and Patio Concentrate page adds that you should "Allow treated vegetation to die back fully before clearing away (minimum of 7 days)". The pack label adds the bit the website leaves out, which is the weather: "Apply at least 8 hours, preferably 24 hours before rainfall for satisfactory results." Doff 24/7 is the exception and promises visual results within 24 hours, because it burns the leaf rather than travelling to the root.
Is Doff weed killer safe to use around bees and pets?
It depends which bottle, and the range is not uniform. The 90 g/L glyphosate concentrates are lightly classified: no pictogram, no signal word, and only "harmful to aquatic life with long lasting effects". Doff 24/7 is recorded as not classified at all and Doff state it is "Non-hazardous to bees". The 360 g/L Power Up is the one to treat differently, because its own safety data sheet carries the environmental pictogram, the signal word "Warning" and "very toxic to aquatic life with long lasting effects". None of those is a re-entry instruction and Doff publish none, so apply the standard the rest of the shelf uses: keep children and pets off until the spray has dried, and keep all of it out of drains and watercourses.
Who makes Doff weed killer?
Doff Portland Limited, of Aerial Way, Hucknall, Nottingham, founded in 1946 and now part of the Pelsis Group. There is a wrinkle worth knowing. On every HSE register entry, Doff Portland are listed as the marketing company rather than the authorisation holder: the glyphosate approvals are held by Sinon EU GmbH and the Doff 24/7 approval by W Neudorff GmbH KG. Doff market and pack under someone else's approval, which is entirely normal in this trade and does explain a lot about why the dose paperwork reads the way it does.
Is Doff weed killer being banned?
No, and the register entry that makes people think so needs explaining. Several Doff glyphosate authorisations show an expiry date of 09/09/2099, which is not a real date. It is HSE's marker for an extension granted under Article 43 while a renewal application is being decided. HSE put it plainly: the authorisation "will be withdrawn once a regulatory decision has been taken". So those products are properly authorised today and their future depends on the glyphosate renewal rather than on anything specific to Doff. Power Up carries an ordinary expiry of 15 June 2029 and Doff 24/7 one of 1 June 2029.
Can I use Doff weed killer on a driveway or patio?
Yes for the 90 g/L products, and check your pack before you assume it for the strong one. HSE list hard surfaces among the approved areas for Doff Advanced Concentrated and Doff Concentrated Path and Patio, and for Doff 24/7. They do not list hard surfaces for either 360 g/L product. Two other things to hold on to. The label says "This product has no residual activity in the soil", so it kills what is growing in the joints today and does nothing to stop the next flush germinating. And a paving joint is where a contact product like Doff 24/7 disappoints most, because the crown down in the sand is untouched by anything that only burns the top.