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Lawn lime buying guide

Updated: October 2026

A mossy patch or a yellow stripe after last summer's drought is not, on its own, a reason to order a bag. A lawn lime buying guide starts with the soil, not the product photo. This page is from Peter F., the DIY & tools editor, on 21 October 2026. He read the seven amazon.co.uk listings on the [lawn lime comparison](/hub/fertiliser-soil-and-bark-mulch/lawn-lime), plus Royal Horticultural Society pages and the Fertilisers Regulations 1991. Nobody here ran a pH trial. A qualifying Amazon purchase can earn us a commission at no extra cost to you. By the end you should know whether to buy calcium carbonate garden lime at all, and which chemical words to refuse.

A mossy patch or a yellow stripe after last summer's drought is not, on its own, a reason to order a bag. A lawn lime buying guide starts with the soil, not the product photo.

Our top picks

Topline Topline garden lime and Epsom salt

Best overall

Topline Topline garden lime and Epsom salt
3.5/10about £18.95
View offer
Westland Westland Lime Soil Conditioner (pack of 2)

Rank 2

Westland Westland Lime Soil Conditioner (pack of 2)
8.2/10about £19.98
View offer
MURIEL BARGAINS Levington Garden Lime 3.5 kg

Best value

MURIEL BARGAINS Levington Garden Lime 3.5 kg
4.0/10about £11.49
View offer
On this page
  1. 1.Test the soil before you buy lawn lime
  2. 2.Garden lime, hydrated lime, gypsum, and dolomitic lime
  3. 3.Why the grams on the bag do not match the next brand
  4. 4.What to check on the listing

Test the soil before you buy lawn lime

The Royal Horticultural Society treats about pH 6.5 as the best general-purpose garden figure and says not to lime at pH 7.0 or higher. Fine grasses prefer slightly more acid conditions than a ryegrass family lawn. If you have not tested, you do not yet have a lime job. A kit reading taken inside three months of lime, fertiliser, or manure can mislead. Do the vinegar check on a dry sample. If the soil fizzes, free carbonate is already present and lime is the wrong product. That stop is the door into lawn lime or sulphur. At pH 6.1–7.0 the RHS usually says you do not need to add anything. Moss or a clubroot scare is not a substitute for the number. If the reading is clearly acid and the grass is not ericaceous, the chemical choice comes next.

Garden lime, hydrated lime, gypsum, and dolomitic lime

Garden lime in a UK centre is ground limestone, calcium carbonate. Under the Fertilisers Regulations 1991 the seller must use a prescribed name and declare a neutralising value. Ground limestone is typically about NV 50–55 and must pass at least 40 percent through a 150 micron sieve. Granules are that carbonate bound for a hand or spreader. Granulation does not raise the lime value. Hydrated lime is calcium hydroxide, about NV 70. It irritates skin and eyes and is not a household lawn bag. Do not copy a garden-lime pet line onto it. Burnt lime and quicklime stay with a professional. Gypsum supplies calcium and does not correct acidity. Dolomitic lime is only for a low magnesium test; magnesian limestone is at least 15 percent MgO. Keep lime off ericaceous plants.
Topline Topline garden lime and Epsom salt

Testsieger

Topline Topline garden lime and Epsom salt
3.5/10about £18.95
View offer

Why the grams on the bag do not match the next brand

Westland's FAQ is 10 g per square metre. Bullets for the same style of bag say 35–70 g. Levington's maintenance table is clay 50 g, loam 75 g, sand 100 g, with a split above 150 g. GreenBest caps one established-lawn pass at 100 g for its own granules. Those figures are not interchangeable. RHS clay rates for the top 20 cm, aimed at pH 6.5, run from 0.6 kg per square metre at pH 6.0 to 1.4 kg at pH 5.0. That is not a lawn sprinkle. Spreading is on how to apply lawn lime. Take the rate from the bag in your hand. UK bags here are usually 3.5–4 kg.

What to check on the listing

The brand field, the kilogram claim, and the included-components line should agree with the title. In this set, two Levington or Westland titles are filed under other seller names, and one unit count disagrees with the kilogram claim. A cheap title that might be 1.5 kg is not a bargain. A bundle that adds Epsom salt is two products. It does not replace a magnesium soil test, and it is not dolomitic lime. Coverage in square feet is a US area claim, not a UK gram table. If the test is already near 6.5, at 7.0 or higher, or the soil fizzes, buy none of the seven listings. If you are still buying, take the integrity check to best lawn lime.

Common questions

Do I need lawn lime if I have not tested the soil?
No. A mossy or pale lawn has several causes, and lime only belongs after a fair pH test shows the soil is acid. The RHS treats about pH 6.5 as the general-purpose figure and says not to lime at 7.0 or higher. A test inside three months of lime, fertiliser, or manure can mislead, so wait rather than guess from the colour of the grass.
Is garden lime the same as hydrated lime or builders' lime?
No. Garden lime is calcium carbonate, typically about NV 50–55. Hydrated lime is calcium hydroxide, about NV 70, more irritating to skin and eyes, and a different rate. Builders' lime and quicklime are not a household lawn product. If the bag does not read as ground limestone or garden lime, do not treat a pet line from a garden-lime label as if it applied.
Will gypsum raise the pH?
No. Gypsum supplies calcium and does not correct acidity. FAS Scotland's liming note makes the same split. If the kit is already near 6.5 and you only wanted calcium, gypsum is a separate decision. It is not a softer substitute for carbonate when the soil is truly acid.
When is dolomitic lime the right buy?
Only when a test says magnesium is low. Magnesian limestone is a magnesium source, not the default lawn bag. A marketing line that mentions calcium and magnesium together is not a soil test. If magnesium is already high, extra magnesium is a poor habit.
Can I lime ericaceous plants or a bed I want for blueberries?
No. Keep lime off ericaceous plants. A soil that fizzes already has free carbonate, and forcing blueberries there with sulphur is not realistic either. Grow those plants in containers with ericaceous compost. A ryegrass family lawn on acid soil is a different job from a rhododendron bed.

Related pages

Lawn lime for moss

Lawn lime

Best lawn lime: seller, weight and a UK review file

How to apply lawn lime with only that bag's own rate

Lawn lime or sulphur: when to raise pH or leave it

Sources

Public UK and maker sources from the research digest, used for this page in October 2026. Prices, stars and review counts are from the seven amazon.co.uk listings captured on 19 October 2026. A moss line is a listing claim. A maker's pet line applies to that garden lime, not to hydrated lime or to every bag. This is not a laboratory test.

  1. RHS, lime and liming (retrieved 19 October 2026)
  2. RHS, soil pH and testing (retrieved 19 October 2026)
  3. RHS, moss on lawns (retrieved 19 October 2026)
  4. RHS, acidifying soil (retrieved 19 October 2026)
  5. Westland Garden Lime (retrieved 19 October 2026)
  6. Levington Lime (retrieved 19 October 2026)
  7. Fertilisers Regulations 1991 (retrieved 19 October 2026)
  8. CAFRE, the value of lime (retrieved 19 October 2026)