The best moss killers, compared.
Top pick: Miracle-Gro Complete 4-in-1 Best value: Greenforce 4-in-1 15 kg – £30.50 listed at 750 square metres, about 4p per listed square metre, with 4.2 from 1,309 reviews. The scorch risk stays in the score. Updated October 2026.
A moss killer in a UK shop is not one product. Lawn packs use iron sulphate, sometimes with a feed and a selective weedkiller, and they blacken moss that you then rake out. Hard-surface sprays are for paths, patios, gravel or decking. The Resolva line will also kill grass, so it does not belong on a lawn. Westland Moss Master is the odd lawn box: the maker says you do not rake and the moss does not turn black. Match the label to the surface, then divide the listed coverage into the price. Shelf prices here run from £4.49 for the Resolva ready-to-use 1 litre to £30.50 for the Greenforce 15 kg bag. The top pick is Miracle-Gro Autumn at £12.48, with iron sulphate named, a September-to-November window, and 4.4 from 440 reviews. The best value is the Greenforce 15 kg at £30.50, listed at 750 square metres, with 4.2 from 1,309 reviews. Which pack belongs on grass is in the [lawn or patio guide](/hub/weed-control/moss-killer/sub/moss-killer-lawn-or-patio).
A moss killer in a UK shop is not one product. Lawn packs use iron sulphate, sometimes with a feed and a selective weedkiller, and they blacken moss that you then rake out.
42 products checked · 58 hrs invested · +21,400 readers
Swipe for more
1-2 of 12
Personal buying guide
Question 1 of 2
Where is the moss?
The Miracle-Gro Complete 4-in-1 is 2.8 kg of lawn food, weed and moss granules with a handheld spreader, listed at 80 square metres for £15. It names dandelions, white clover and plantain, and it is for established lawns from April to September once frosts have gone. Children and pets can return after the granules are watered in and the area has dried. It has 4.4 from 444 reviews and ranks 1 in Lawn Fertilisers. The active ingredient is not named in the spec block. It fits a small established lawn with those weeds in the growing season. It is the wrong pack for a path, or for a September-to-November iron treatment.
Pros
Cons
Best for: An established lawn from April to September when you want feed, named broadleaf weeds and moss in one spreader pass.
Less suitable: Hard surfaces, winter moss, and large lawns where a 15 kg bag is the cheaper rate.
Specifications
Common questions
When does the listing say to use it?
On established lawns from April to September, once frosts have gone.
When can children and pets use the lawn?
Once the granules have been watered in and the area has dried.
Which weeds are named?
Dandelions, white clover and plantain.
The Miracle-Gro Autumn pack is lawn food and moss control for 80 square metres at £12.48, with iron sulphate and an NPK of 6-5-10 printed on the listing. Moss blackens in seven days and must be raked after two weeks, and the season is September to November. Children and pets stay off until the granules are watered in and dry. It has 4.4 from 440 reviews and ranks 2 in Moss Control. The pack-size cell says 2.8 kg while the item weight is 3.1 kg. It is the clearest iron-and-rake lawn treatment in this set if you will remove the black moss. It does not belong on a patio, where iron marks paving.
Pros
Cons
Best for: An autumn lawn where you will water the granules in, keep pets off until dry, and rake black moss after two weeks.
Less suitable: Patios and paths, summer weed control, and anyone who will not rake.
Specifications
Common questions
When is it for?
September to November, to toughen the lawn for winter.
Do you have to rake?
Yes. The listing says moss blackens as it dies and must be raked out after two weeks.
Does it claim to fix drainage?
The listing asks. The bullets do not say it improves drainage.
The Miracle-Gro Mosskill 1 litre is a lawn concentrate listed at up to 67 square metres for £12, model 121280. The claim is moss control plus a lawn feed, with grass growth into bare patches and a greener lawn in three days. It has 4.4 from 186 reviews. Weed control is not in the bullets, and the specification block does not answer the child-safety question. You have to dilute it, but the Amazon bullets do not give the mixing method. The rank is 133 in Lawn Fertilisers, not a path-cleaner rank. Use it on a lawn you are happy to dilute for. Skip it if you also need dandelion or clover control from the same bottle.
Pros
Cons
Best for: A lawn moss-and-feed job you will mix in a watering can, without expecting broadleaf weed control.
Less suitable: Paths and patios, and lawns where clover, dandelion or plantain are the main problem.
Specifications
Common questions
Does it kill weeds?
The listing asks. The bullets claim moss control and lawn feed, not weeds.
Is a child-safety line printed?
The listing asks and the specification block does not answer.
What area does the listing claim?
Up to 67 square metres from 1 litre.
The Resolva Path and Drive 3 litre is a weedkiller that also claims moss and algae on paths, drives, patios and gravel, with pelargonic acid named, at £18. The listing says you can use it all year, and reviewers sweep dead tops after about a week. It has 4.3 from 46 reviews. No square-metre coverage and no children or pets line appear in the specification block. The item type is weedkiller, not a lawn moss granule. It fits hard surfaces where you want weeds and moss in one spray. It is the wrong bottle for a lawn feed, or for a job that needs a printed coverage rate before you buy.
Pros
Cons
Best for: Paths, drives, patios and gravel when weeds and moss are both in the joints and you can sweep after about a week.
Less suitable: Lawns, and anyone who needs a printed coverage figure or a pet instruction before buying.
Specifications
Common questions
Does the listing say it kills moss?
Yes. A bullet says dual action against weeds and moss, and another says it affects algae on hard surfaces.
Can it be used on gravel?
Yes. The bullets name gravel with paths, drives and patios.
Is a pet line printed?
The listing asks. The specification block does not answer.
The Greenforce 3 kg powder is listed as a lawn weed, moss and feed treatment covering 150 square metres for £15.25. It has 4.2 from 2,231 reviews, the largest count in this set. The bullet says it kills weeds and moss and greens the grass, and nothing more specific. No season, pet line, active ingredient or time-to-death is in the specification block, and the included-components line is fertiliser with no spreader. Reviewers note chunks that block a spreader. Rank is 47 in Moss Control. It is a mid-size lawn powder if you already own a spreader and can deal with lumps. It tells you less about pets and timing than the Miracle-Gro boxes.
Pros
Cons
Best for: A medium lawn when you already have a spreader and you can sieve or break up lumps.
Less suitable: Hard surfaces, and buyers who need a printed season, a pet line, or an applicator in the box.
Specifications
Common questions
Does the listing say it is safe for pets?
It asks. The specification block does not answer.
How fast does it say weeds die?
It asks whether weeds die quickly. The only bullet says it kills weeds and moss and greens the grass. No time is given.
Is an applicator included?
The included-components line says fertiliser. Reviewers note there is no spreader in the box.
The Greenforce 15 kg bag is a lawn feed, weed and moss granule listed at 750 square metres for £30.50, about 4p per listed square metre, the lowest rate in this set. It has 4.2 from 1,309 reviews, and the rank is 9 in Moss Control. The listing says apply every 4 to 6 weeks, and reviewers use a broadcast spreader. Those same reviews report scorch where the spreader dumps a pile. The active ingredient is not named, and the specification block does not answer the pet question. It suits a large established lawn you will treat on that interval. It is the wrong bag if the moss is on paving.
Pros
Cons
Best for: A large lawn you will spread on a 4-to-6-week interval and where a low price per square metre matters.
Less suitable: Patios, paths, and lawns where you need a named pet line or a named active ingredient.
Specifications
Common questions
Does the listing name clover?
It asks whether clover is killed. The bullets say all major weed types and do not name clover.
Is a pet line printed?
The listing asks. The specification block does not answer.
How often does the listing say to apply it?
Every 4 to 6 weeks.
This ready-to-use Resolva spray is the lowest shelf price in the set, £4.49 for 1 litre listed at 10 square metres on block paving, gravel and decking. The bullets claim results in hours, rain-fast in one hour, and a non-staining formula. It has 4.2 from 423 reviews. Reviewers cite a winter ban that the Amazon bullets do not print, including a closed period from September to 1 April, and several say the nozzle failed. The title and unit count say one litre while a spec field says three packs, and the raw file does not resolve that. Lawn use is not in the bullets. It is a small permeable-surface job if the trigger works, and a poor match for a lawn or a winter spray.
Pros
Cons
Best for: A small block-paving, gravel or decking job outside the closed season, if you accept trigger complaints.
Less suitable: Lawns, concrete or tarmac, and anyone spraying between mid-September and 1 April.
Specifications
Common questions
Can it be used on lawns?
The listing asks, and the bullets do not say yes. They name block paving, gravel and decking.
Does the Amazon text give a season?
No. Reviewers say the bottle forbids winter use, including from September to 1 April.
Is it one bottle or three?
The title and unit count say 1 litre. A spec field says Number of Packs: 3. The raw file does not resolve that.
Green Gone is a 5 litre ready-to-use algae, mould and moss treatment applied from a watering can, listed at up to 50 square metres and up to nine months, for £12.80. The bullets say it contains no acids or bleach, that you leave it on, and that children and pets need not be excluded once the area is dry. It has 4.2 from 318 reviews. Reviews describe patios, paving and concrete, which the bullets call hard surfaces. The listing asks about lichen and does not name it, and one review said the watering can was missing. The active is not given as a chemical name. It fits a wide hard surface you will leave to dry. It is not a lawn feed or a selective weedkiller.
Pros
Cons
Best for: Patios, paving and other hard surfaces when you want a leave-on treatment and a once-dry pet line.
Less suitable: Lawns, selective weed control, and lichen, which this listing does not claim.
Specifications
Common questions
Can it be used on patios?
The listing asks. The bullets say hard surfaces, and reviews describe patios, paving and concrete.
Does it claim to kill lichen?
The listing asks. The bullets name algae, mould and moss, not lichen.
Do children and pets have to stay off?
The bullets say they need not be excluded once the treated area is dry.
The Resolva 1 litre at £8.99 is listed at 10 square metres, about 90p a square metre if you take that coverage as printed. The specification block does not name a surface, an active ingredient, a season, or a children and pets line. It holds 4.1 from 71 amazon.co.uk reviews. Among the 12 reviews in the extract, several say the nozzle stopped working or the bottle arrived smashed and leaking. The country of origin is the United Kingdom and the rank is 25 in Moss Control. You cannot tell from this page whether it is the permeable-surface spray or another Resolva liquid, so the listing is thin for a path-or-lawn decision.
Pros
Cons
Best for: A small liquid job only if you already know this bottle matches your surface, because the listing itself does not say.
Less suitable: Anyone choosing between a lawn and a patio from the specification block, or anyone who needs a reliable trigger.
Specifications
Common questions
Does the listing say it can be used on patios?
The listing asks the question and does not answer it in the specification block. Surface limits are not printed there.
What do the reviews say about the sprayer?
Among 12 UK reviews, several say the nozzle stopped working or the bottle arrived smashed and leaking.
Is a pet instruction printed?
No. The raw specification block does not state a children or pets line.
The 3 litre Resolva sold with Topline in the brand field costs £25.95 and lists fatty acids, 10 square metres per litre, and use when moss is growing in late spring to early summer or late summer to early autumn. Children and pets return after drying. It has 3.9 from 23 reviews. The title says drives, paths, lawns and roofs, while the bullets say block paving, gravel and decking and that the formulation removes grasses. Those lines conflict, so a lawn or a roof is not a safe reading of this page. It is a large permeable-surface bottle only if you follow the bullets. It is a poor buy if you wanted a lawn treatment or the cheaper 1 litre.
Pros
Cons
Best for: A larger permeable-surface job if you ignore the lawn and roof words in the title and follow the bullets.
Less suitable: Lawns, roofs, and shoppers who can use the £4.49 one-litre Resolva on the same surfaces.
Specifications
Common questions
Can it be used on lawns?
The title says lawns. A bullet says the formulation removes all green growth including grasses. Those lines conflict.
When does the listing say to use it?
When moss is growing, in late spring to early summer or late summer to early autumn.
What is the brand on the listing?
The brand field says Topline. The product name says Resolva.
The Westland Moss Master box covers 80 square metres at £11.10, and the bullets say no raking, no black moss, and no staining or rusting of paths and patios. It has 3.7 from 77 reviews, the lowest star line among products that have a rating. Several of the 14 reviews say people still raked, and one reviewer disputed a child-and-pet claim that the specification block does not print. How you apply it, and the season, are not in the bullets. It is the pack to read if you want to avoid a black lawn. It is a weak choice if you need an explicit rake date or a review base above 4 stars.
Pros
Cons
Best for: A lawn owner who wants the no-rake claim and will read the mixed reviews before skipping the scarifier.
Less suitable: Anyone who needs a printed rake date, a 4-star review base, or a hard-surface treatment.
Specifications
Common questions
Does the listing say you must rake?
No. A bullet says no raking is required. Several of the 14 reviews say they still raked.
Does it claim to stain paths?
The opposite. A bullet says no staining or rusting of paths and patios.
Is a pet line in the specification block?
The listing asks if it is pet friendly. The specification block does not answer. One reviewer disputed a child-and-pet claim.
This generic 5 litre jerrycan is labelled 20% ferrous sulphate at £14.97, with a title that says pro grade and a claim of moss deterrent and lawn tonic, including sports turf. The raw file has no customer-review line, no MAPP number and no square-metre rate. The weight cell says 1 kg against a 5 litre volume. Application is given as a sprayer or watering can. The bullets do not claim weed control. RHS guidance is that fertiliser-grade ferrous sulphate should not be used to kill lawn moss unless it sits inside an HSE-approved proprietary mosskiller, and this listing does not show that approval. Leave it if you need an amateur moss-killer label you can check.
Pros
Cons
Best for: Nobody in this comparison who needs an authorised amateur moss killer with a coverage rate and UK reviews.
Less suitable: Lawn moss control bought as a garden pesticide, and any hard surface.
Specifications
Common questions
Does the listing show a star rating?
No. The raw file has no customer-review line.
Does it name a MAPP number?
No.
Does it claim to kill weeds?
The listing asks. The bullets describe a moss deterrent and a lawn tonic, not weed control.
Twelve moss killers on amazon.co.uk were scored from listing facts and review notes, not from a laboratory trial. There is no separate methodology file for this set. The top pick and the best value are the display awards: Miracle-Gro Autumn, and the Greenforce 15 kg bag. The visible score starts from how complete the label is, then the amazon.co.uk star line and the review count, then cuts for faults such as a failed nozzle, scorch, a missing authorisation number, or a title that fights the bullets. Price does not enter the score. Price decides only the best-value badge. A listed square-metre rate is a manufacturer claim. The score ranks a listing inside this set. It is not an HSE approval.
Label match
35%Surface, job, active ingredient, season, pet line and a coverage figure you can divide into the price. A blank surface line is a cut. A named iron, a rake date and a pet line keep a lawn box high.
Amazon stars
30%The amazon.co.uk star average on that listing. A 4.4 from several hundred reviews is not the same evidence as a 4.4 from a thin sample, which is why review volume is scored beside it.
Review volume
15%A small sample cannot carry the same weight as a thousand reviews. The Greenforce 3 kg bag has 2,231 reviews. The Resolva 3 litre has 23. The ferrous jerrycan has no review line.
Listing faults
20%Cuts come off last for a failed nozzle, a smashed bottle, spreader scorch, chunks that block a spreader, a pack-count clash, a title that names lawns while the bullets remove grass, or no MAPP number on a pro-grade iron can.
Start with the surface, then the job, then what you do after treatment, then the season on that label, then children, pets and stains, then coverage divided into the price. The notes below follow that order for these twelve amazon.co.uk listings. None of the scores is a laboratory trial.
A moss killer on these amazon.co.uk listings is one of two families, and they are not interchangeable. Lawn packs use iron sulphate, sometimes with a feed and a selective weedkiller. They blacken moss that you then rake out. In this set that is Miracle-Gro Autumn, the two Greenforce bags, Miracle-Gro Complete 4-in-1, Miracle-Gro Mosskill, Westland Moss Master, and a generic 20 per cent ferrous sulphate jerrycan. This page does not treat that jerrycan as an authorised amateur moss killer.
Lawn iron stains paving, decking and indoor floors. Brush a spill off. Do not wash it into the joint with water. Miracle-Gro Autumn belongs on the lawn, then a rake, not on a patio.
The Resolva line kills grass as well as moss. The maker bars lawns, concrete and tarmac, and the closed season on the maker’s page runs from 18 September to 1 April. A title that mentions lawns does not overrule a bullet that removes grasses.
Moss returns if shade, compaction and poor drainage stay. A paused spreader that dumps granules scorches the lawn. One feed bag does not replace a drainage fix, and vinegar or bleach is not a lawn moss killer.
The first split is the surface. Lawn iron stays on grass. Resolva stays on permeable surfaces named on the bullets: block paving, gravel and decking. Concrete and tarmac need a label that allows an impermeable surface. Green Gone’s bullets say hard surfaces, and reviews mention concrete. Stars do not move a listing from one family into the other. The job is the second split. Moss only is Autumn, Mosskill or Moss Master.
Use the season on that label. Complete 4-in-1 is April to September, after frosts. Autumn is September to November. The Resolva maker’s page excludes 18 September to 1 April, and reviewers of the £4.49 bottle cite that ban even though the Amazon bullets omit it. Path and Drive says all year. A closed-season spray in January is a mistake even if the bottle is cheap. Pet lines are product-specific. Autumn and the 4-in-1 allow children and pets after watering in and drying.
Three typical situations, each with a recommendation from this comparison.
You want iron named on the box, a September-to-November window, and a date for raking black moss. Miracle-Gro Autumn is £12.48 for 80 square metres, at 4.4 from 440 reviews. Children and pets stay off until the granules are watered in and dry. It does not belong on a patio.
You will treat a big established lawn every 4 to 6 weeks and you care about pence per square metre. The Greenforce 15 kg bag is £30.50, listed at 750 square metres, with 4.2 from 1,309 reviews. Reviewers report scorch if the spreader dumps a pile. The active ingredient is not named.
The moss is on a permeable surface, not in the grass. The Resolva ready-to-use 1 litre is £4.49, listed at 10 square metres on block paving, gravel and decking, with 4.2 from 423 reviews. Keep it off the lawn. Reviewers cite a failed nozzle and a winter ban the bullets do not print.
In this set of twelve amazon.co.uk listings, the top pick is Miracle-Gro Autumn. It is £12.48 for 80 square metres, with iron sulphate and an NPK of 6-5-10 named, moss that blackens in seven days, a rake after two weeks, and a September-to-November season. It averages 4.4 from 440 reviews. Children and pets stay off until the granules are watered in and dry. The best value is the Greenforce 15 kg bag at £30.50, listed at 750 square metres, about 4p per listed square metre, with 4.2 from 1,309 reviews. That score sits below the autumn box because the active, the pet line and the scorch risk are unresolved. The other ten have no award. None of these scores is a laboratory trial, and none of them is a permanent cure if shade, compaction and poor drainage stay.
Greenforce 4-in-1 15 kg
£30.50 listed at 750 square metres, about 4p per listed square metre, with 4.2 from 1,309 reviews. The scorch risk stays in the score.
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. Shelf prices and star lines are the amazon.co.uk figures in the display file. Coverage rates are manufacturer claims, not a trial 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 the UK listing figures in the display file, not a live check on 16 October 2026. We did not lab-test these moss killers.
