23 Types of Gravel for Gardens: A UK Guide to Choosing Decorative Stones

Key Takeaways

• Shape decides whether a gravel works, not colour: angular crushed chippings lock together and stay put, while rounded gravels like pea gravel roll underfoot, migrate downhill and track into the house.
• Use 20mm angular chippings for nearly every driveway and for borders, 6-14mm for paths, and I only go below 10mm for resin-bound work, planter tops and play areas.
• Around a third of the “types” sold in the UK are not stone types at all: driveway gravel, drainage gravel, 10mm gravel and white gravel are merchant categories, and two suppliers can send different stone types under the same name.
• Lay gravel roughly twice as deep as the stone is big on anything you walk or drive across – about 20mm of depth for 10mm gravel, 40mm for 20mm gravel – which works out at around 13m² from an 850kg bulk bag.
• Limestone-based gravels such as Cotswold, marble and white limestone slowly raise soil pH, so I keep them off ericaceous beds, such as rhododendrons, camellias, blueberries and heathers, and out of fish ponds.

Introduction

The question I get asked most on a gravel job is not which colour. It is “why does it keep ending up on the lawn?” Nine times out of ten it is the same picture: somebody bought a rounded stone for a job that needed an angular one, and no amount of raking fixes that. I was once called to a border with a decent gradient, where the owners had laid six tonnes of 10mm pea gravel over a gentle slope. Within two months most of it had walked to the bottom and the rest was in the kitchen. We lifted the lot and relaid in 20mm crushed granite.

There are 23 things sold as “types of gravel” here. Some are genuinely different stone. Some are the same stone under a different name because a merchant’s website needed a category.

Which Type of Gravel Should You Choose for Your Garden?

Choose by shape first, then size, then colour. Angular crushed chippings for anything you walk on, drive on or want to stay put; rounded gravels for beds, pots, drainage and anywhere nobody puts their weight. Colour is the last decision, and the one people spend all their time on.

Get shape and size right and almost any colour works. Get it wrong and the prettiest stone in the yard will still annoy you every week. If you are choosing between gravel and a hard surface rather than choosing a stone, start here. Front gardens are their own problem, because the stone has to work against the house rather than the planting. See our front garden gravel ideas for ten layouts and how to pick a colour that suits your brickwork. If the answer is a whole gravel garden rather than a path or a border, the stone is only part of it: see low maintenance gravel garden designs for how the choice of stone, planting and scheme together decide the upkeep.

What Is the Difference Between Decorative Gravel and Construction Gravel?

Decorative gravel is graded and usually washed so it looks good loose on the surface; construction gravel is graded so it compacts, drains or makes concrete, and nobody cares how it looks once buried. The overlap is bigger than most suppliers admit. Plenty of construction aggregate makes a good decorative surface – 20mm washed shingle is a budget ground cover people pay twice as much for elsewhere. It does not work in reverse: MOT Type 1 is a base material, and no optimism turns it into a finish.

The 23 Types of Gravel Explained

TLDR: there are really four families here – water-worn and rounded, crushed and angular, fines-based and binding, and one manufactured product. The rest are trade categories describing a size, a use or a colour rather than a stone.

Rounded and Water-Worn Gravels

Smoothed by water, so the stones roll over each other instead of locking. Free-draining and kind on bare feet, hopeless where they must stay put. Worth knowing why they come in the colours they do: only harder rock survives being battered downstream, so chalk and soft limestone are effectively absent from rounded gravels, while granite, quartzite and sandstone are plentiful.

1. Pea Gravel

Small, smooth, naturally rounded stones, usually 6mm to 10mm, in mixed buff, grey and brown. Popular because it looks soft and costs little. Also the most complained-about gravel there is, for reasons further down.

Best for: planter tops and decorative beds with no foot traffic.

2. Pea Shingle and Shingle

Rounded to sub-angular, often shaped like a rounded triangle, from roughly 6mm to 30mm. It beds down better than true pea gravel without ever behaving like an angular chipping. The two names get used interchangeably in the trade.

Best for: coastal-look ground cover, drainage runs, concreting at 20mm.

3. River Rock and River-Washed Gravel

Rounded by rivers and beaches, so the parent stone varies with the geography of the pit – sedimentary, igneous and metamorphic in one scoop. That mixture is why it reads as natural. Trent gravel is the classic.

Best for: dry streambeds, pond margins, naturalistic beds.

4. Washed Gravel

Usually sold as 10mm or 20mm shingle. A budget aggregate washed to take out the dust and fines (the powdery small stuff), which lifts both appearance and drainage. Fish-safe and cheap.

Best for: ground cover on a budget, soakaways, pipe bedding.

Crushed and Angular Chippings

Mechanically crushed, so every face is fractured and the stones interlock under pressure. The trade calls them clean – solid lumps with few or no fines. The family I reach for on nine jobs in ten.

5. Crushed Gravel

The general term for rock broken by a crusher into sharp, angular pieces. The angularity is the point: it compacts into a firm surface. Not comfortable barefoot, and never will be.

Best for: driveways, paths, sub-bases, anything load-bearing.

6. Stone Chippings

Crushed stone sold decoratively, from all sorts of parent rock, in the widest colour and size range of any category – polar white to red granite.

Best for: driveways, borders, paths, contrast against planting.

7. Slate Chippings

Fine-grained metamorphic stone that splits into flat plates, which is why slate looks unlike anything else loose in a garden. Blue, grey, green and plum. Inert, so it is safe around fish and acid-loving plants, and the flat pieces knit together and suppress weeds.

Best for: modern ground cover, pond surrounds, mulching beds. See slate chippings and laying slate chippings.

8. Cotswold Gravel

Angular limestone in warm buff and honey tones that go properly golden when wet. It interlocks well, so it is a genuine driveway and path material, not just a pretty one. Being limestone, it slowly raises pH.

Best for: cottage and period settings, drives, paths. See Cotswold chippings.

9. Basalt Gravel

Volcanic rock, dark and fine-grained, formed where lava cooled fast at the surface. Hard-wearing, sleek, and it darkens to near-black when wet. A good choice where you want foliage to stand out.

Best for: modern drives and paths, contrast against planting.

10. Marble Chips

Metamorphosed limestone, with that sparkle when light catches the crystal faces. Bright and smart, with the same pH caveat as Cotswold. Higher maintenance in shade.

Best for: feature beds, formal planting, small high-impact areas. Everest Blue is the obvious starting point.

11. Lava Gravel

Porous volcanic rock, usually red or black, light for its bulk with excellent drainage. Seen more in aquariums and hydroponics than British gardens, but it turns up in dramatic planting.

Best for: container drainage, feature planting, aquascaping.

Fines-Based and Construction Aggregates

These contain dust and small particles as well as stone. The fines make them bind – and make them wrong wherever water needs to move freely.

12. Self-Binding Gravel

Stone, sand and fines graded together so that compacted they knit into a firm, permeable surface. The look of loose gravel without the loose gravel, which is why it is all over heritage sites. Breedon gravel, a crushed limestone off the Nottinghamshire and Derbyshire borders, is the best known and gives that warm buff; Coxwell is the Oxfordshire equivalent. Hoggin, the south-east’s clay-bearing version, binds but goes claggy in the wet.

Best for: paths, seating areas, pram and wheelchair routes. See the self-binding range.

13. Decomposed Granite and Grano Dust

Decomposed granite is a US product: granite weathered in place into gravel, sand and silt. The nearest thing here is grano dust or granite self-binding gravel. If you have read an American blog and gone hunting for DG, this is it.

Best for: rustic paths and compacted surfaces.

14. Stone Dust

Finely crushed stone, also called rock dust. Mostly a bedding and levelling material under pavers and slabs. It can surface a path like self-binding gravel, though it shows every footprint after rain.

Best for: bedding layers, levelling under paving.

15. Crushed Rock

The catch-all for crushed construction stone, also sold as hardcore or crusher run. MOT Type 1 is the one most people meet, graded from around 40mm down to dust so it compacts rock solid.

Best for: sub-bases under drives, paths and patios.

16. Quarry Process

An American term for a dense-graded blend of small crushed stone and stone dust. Here you would buy MOT Type 1 or quarry scalpings and get the same thing. Worth knowing only because it turns up in advice written for another country.

Best for: sub-bases, under its UK name.

17. Ballast

A ready-blended mix of sand and gravel, the stone typically around 20mm, sold for making concrete. Not decorative, but every garden build needs some at the footings stage. See ballast.

Best for: concrete for post bases, footings and haunching.

Manufactured Gravel Surfaces

18. Resin-Bound Gravel

Fine gravel mixed with a resin binder and trowelled to a smooth, hard, permeable surface. The only genuinely low-maintenance option here: no raking, no migration, no weeds. It costs considerably more and is unforgiving of a poor base. Resin-bound kits make it a realistic DIY upgrade over sound concrete.

Best for: drives and paths over an existing solid surface.

Trade Categories That Are Not Really Stone Types

These five are real product categories, but each describes a size, a use or a colour rather than a stone – and the material behind the label changes between suppliers and loads.

19. 10mm Gravel

A size, not a stone. One of the commonest landscaping sizes and usually among the cheapest, and it arrives as rounded shingle or angular chippings depending where it came from. Order a sample of 10mm gravel if looks matter.

20. 20mm Gravel

The other default size, and my usual answer for drives and anywhere that needs to resist displacement. Same caveat: 20mm rounded shingle and 20mm crushed chippings behave completely differently, and both sell as “20mm gravel”.

21. Driveway Gravel

A use, not a type. In practice it means angular crushed chippings from 10mm to 20mm, because that is what beds down under tyres – 20mm is the usual pick, but 10mm and 14mm both do the job. Useful shorthand, but check what stone sits behind the label. Our driveway gravel range is filtered that way.

22. Drainage Gravel

Another use category: clean washed stone with the fines taken out, usually 20mm, for French drains and soakaways. The critical word is clean. Anything dusty silts up and the drain stops working.

23. White Gravel

A colour category covering white limestone, marble and some quartz. Useful for brightening a dark corner, and the highest-maintenance aggregate we sell, because white stone goes green in shade and shows every leaf that lands on it.

Which Types of Gravel Work for a Driveway?

For a driveway I want angular crushed chippings between 10mm and 20mm, in a hard stone – granite, basalt, flint or hard limestone. Angular so it interlocks and resists rutting; within that range I default to 20mm, because it stays put best and is the least likely to lodge in tyre treads and get carried off down the road.

What I avoid: anything rounded, and anything under 10mm. Rounded stone rolls under a turning wheel and you get ridges either side of the tyre tracks within a season. Darker stone hides oil and dirt far better, worth a thought if the car leaks.

The stone is only half of it – the sub-base matters more. Loose gravel is permeable by nature, one reason it stays popular for front drives, though if you are surfacing over a front garden the planning position is worth checking before you order. Full detail in the driveways guide and the method in how to build a gravel driveway.

What Size Gravel Do You Need? Fine, Medium or Coarse?

Gravel runs from about 6mm to 60mm. Anything finer than that is grit, anything coarser is a cobble. The split that actually matters: 6mm to 14mm for anywhere feet do the work, 10mm to 20mm for anywhere tyres do. Go finer than 6mm on a path and it rides home in your boots; go coarser than 20mm on a drive and it stops interlocking properly.

The formal classification is ISO 14688: fine gravel is larger than 2mm up to 6.3mm, medium larger than 6.3mm up to 20mm, coarse larger than 20mm up to 63mm. Sizes outside those two bands each have a job: 2mm to 6mm for resin-bound work, 20mm to 40mm at pond edges and dry streambeds, 20mm ballast for concrete.

How Deep Should Gravel Be?

Deep enough to hide what is underneath, and no deeper than about twice the size of the stone. The second half is the part nobody selling gravel mentions, including most merchant coverage tables. 10mm gravel wants roughly 20mm of depth, 20mm gravel roughly 40mm. Go much past that and feet and wheels stop skimming across the surface and start sinking into it.

That is not a rule invented to sell less stone. It is the same behaviour used on purpose in the gravel traps at racetracks and alongside steep descents: the material shifts under load and the vehicle sinks in and stops. Lay a drive 100mm deep in 10mm gravel and you have built one of those outside your front door.

The exception is a bed nobody walks on, where the gravel’s only jobs are covering the membrane and holding moisture in. There, 40mm to 50mm is right and the depth costs you nothing but stone.

So: 40mm to 50mm on beds and borders, roughly twice the grade size on anything you walk or drive across.

How Much Gravel Do You Need to Order?

Measure the area, multiply by the depth from the section above, and add about 10%. Gravel settles, and coming up half a bag short is infuriating.

From my research and product data:

• An 850kg bulk bag covers roughly 10m² at 50mm depth, or 13m² at 40mm.
• A tonne of typical 20mm gravel covers roughly 12m² at 50mm, or 15m² at 40mm.
• A 25kg bag covers roughly 0.3m² at 50mm – about three bags per square metre.
• Slate is lighter than granite or limestone, so a tonne covers more ground at the same depth. Worth factoring in when comparing prices per tonne – the cheaper-looking stone is not always the cheaper job.

One layer that does not follow the twice-the-grade rule is the sub-base beneath it. A driveway wants 100mm to 150mm of compacted MOT Type 1 under the gravel, and that is not the corner to cut. Our gravel calculator does the arithmetic. What goes underneath is covered in what to put under gravel.

Why Does the Same Gravel Look Different Between Loads?

Because natural stone is quarried, not manufactured, and the seam changes as the quarry works through it. Two bulk bags of the same product bought six months apart can differ in colour, in the spread of sizes and in how much dust is on them. I have been caught out topping up a path from a later batch. It never quite matched.

• Order the whole area in one go. Topping up two years later is where a mismatch shows worst.
• Get a sample, and wet half of it. Almost every gravel looks different wet. Cotswold deepens to honey, slate goes near-black and vivid, grey basalt turns almost black, white marble is brightest bone dry. Choose from a photograph taken in the rain and you are not choosing the stone you will see most of the year.
• Expect the first load to look dusty. Most decorative aggregate arrives with a film of quarry dust and comes up after the first rain.

Which Gravels Are Wrong for Your Garden?

Nobody tells you a stone is a bad idea while they are quoting for it. So here is the list I give clients.

1. Cats. Rounded gravel at 10mm or under reads to a cat as an enormous litter tray. Go up to 20mm and go angular.
2. Prams, wheelchairs and walking sticks. Loose rounded gravel is miserable to push a wheel through. Self-binding or resin-bound is the answer, not a smaller stone.
3. Bare feet. Angular chippings are sharp - that is the point of them. Around a pool, hot tub or play area, use rounded stone or play gravel.
4. Acid-loving plants. Limestone, Cotswold and marble lift soil pH as they weather. Rhododendrons, camellias, azaleas, blueberries and heathers will sulk. Use slate or granite.
5. Fish. Same materials, same problem: limestone shifts pH and hardness in a pond. Slate and washed gravel are inert.
6. Deep shade. White and pale stone goes green in a shady corner and you will be scrubbing it - see cleaning garden stones if you have already made that call.
7. Dogs. Small gravel sticks to mess and makes clearing up grim. Larger and angular is the lesser evil.

One myth while I am here: a lot of gardening guides say a band of sharp gravel stops slugs. In my experience it does not, or not for long. Once it is damp they cross it happily.

Gravel is also not a zero-maintenance surface, whatever you have read. You will rake it, weed it and top it up, and it is heavy work to remove if you change your mind. It still earns its place in most gardens. If you have some spare, there are 13 uses for leftover gravel worth a look.

Next Steps

We carry the full range across gravel and chippings, from 10mm and 20mm washed gravel through to decorative stone, slate chippings, self-binding gravels and driveway gravel, in handy and bulk bags with nationwide delivery.

Which gravel have you used in your own garden, and did it turn out how you pictured it? Love to hear in the comments.

FAQs

What is the best gravel for a garden path?

Angular crushed chippings at 6mm to 14mm. They interlock into a firm surface, they are comfortable underfoot, and that size is the trade default for anywhere that only takes feet. Method in how to lay a gravel path.

Is pea gravel a bad choice?

For anything you walk on, in my opinion yes. It never compacts, and it migrates constantly - downhill, into the lawn, into the house. For planter tops, beds and pure decoration it is lovely and I use it happily.

What is the difference between gravel and chippings?

Gravel usually means stone rounded by water; chippings means stone that has been crushed, so the faces are fractured and angular. Merchants use both words loosely, which is why I check shape rather than name.

What is coarse gravel used for?

Coarse gravel is anything from 20mm up to 63mm under the ISO classification, and in a garden it has three real jobs: pond edges and dry streambeds, where 20 to 40mm looks natural and stays put; clean 20mm for French drains and soakaways, where the voids between the stones are the whole point; and 20mm ballast for concrete at the footings stage. Any coarse gravel over 20mm is not ideal for paths or a drive because can stop interlocking, particularly rounded gravel.

Do weeds grow through gravel?

Yes, eventually, whatever anyone tells you about membrane. Fabric stops weeds from below, but seed blows in and germinates in the dust and leaf litter between the stones. A sensible depth and a rake through twice a year keeps it manageable.

What is the cheapest type of gravel?

Washed 10mm and 20mm shingle is normally the cheapest decorative option. MOT Type 1 is cheaper still but it is a sub-base, not a finish. The cheapest job is not always the cheapest tonne - a lighter stone covers more ground.

Can you lay gravel straight onto soil?

You can, and it will sink into the soil and disappear within a couple of years. On anything you care about, excavate, compact and get a membrane and sub-base down first - see what to put under gravel.