Key Takeaways
- Landscaping with large rocks looks most natural with a third to a half of its height below ground, so the ground meets it at its widest point and no gap shows underneath.
- Large rocks read as an outcrop when grouped in odd numbers, in one stone type and in different sizes, with any visible banding running the same way.
- Sandstone and Cotswold limestone are the usual choices for a soft, weathered look in a British garden; granite and slate suit modern schemes and water.
- Garden boulders weigh roughly 45kg to 1,400kg and are priced by the tonne, so the weight decides the delivery method before the design does.
- A rock already in the garden, or bedrock showing through a lawn, is nearly always cheaper to keep and plant around than to break out.
I remember doing one of my first front garden large rock features, where the client had picked out three really nice boulders, but once they were in, they just didn’t look right. They looked more like they’d been delivered that morning than something that had always existed in the garden. After calling on an old colleague, I realised that it was because the majority of the rock was still sitting on top of the soil and they were too evenly spaced. In the end, I took one out and dug the biggest one properly into the ground, and that was all it needed. I’ve come across the same problem plenty of times since. With large rocks, it’s less about finding a different stone and more about how you set it – whether the group looks natural – and how you’re actually going to get it into position!
8 landscaping with large rock ideas
Every one of these follows the same three immutable rules: partly buried, grouped in odd numbers, and all from the same stone. Jobs I’ve been called out to rescue had always broken at least one of the three.
1. The lawn-edge outcrop
One big stone, two clearly smaller ones from the same batch, set where a bed meets the lawn. Two of them almost touching and the third a stride away. Bury a third to a half of each so they look uncovered rather than delivered, and run any banding in the stone the same way, roughly level with the ground. Then plant the join with something low and spreading. Three in a row, evenly spaced, is a car park. Three in a loose triangle is an outcrop.
2. The path bend
A single stone on the outside of a bend, so the path goes round it rather than past it. Knee height, about 45 to 60cm showing, is enough to read from the far end of the garden. The stone gives the bend a reason to exist, which is the difference between a path that wanders and a path that looks designed. On a gravel path, sink the stone before the gravel goes down so the gravel runs up to it rather than round a lip.
3. The dry stream
Boulders on the outside of each bend, set first, then cobbles, then gravel. The big stones sit where moving water would hit the bank hardest, and they pin the whole feature down. This is the one look where an odd-number group is doing structural work as well as decorative, and the full build is in the dry streambed guide.
4. The banked slope
Large rocks set into a bank, stepped up the slope, each one a third to a half buried and leaning back into the hill. Between them go planting pockets. This is the prettiest way I know of holding a slope that is a nightmare to mow, and up to about waist height it needs no footing, just the stones set deep. Above that you are building a wall, with a footing and drainage behind it, and I would get it looked at before starting.
5. The pond edge
Group the stones at one end of the water, not all the way round. A boulder that overhangs the edge by 2.5 to 5cm hides the liner and throws shade that fish and frogs use – you can extend it further, but it will need to be properly secured. Put one flat-topped stone where you will kneel to clear the pump. A ring of matching stones round a pond is the single most common water feature mistake I saw, and it always looked like a necklace. The rest of the edge, the shelf under the stones and the safe stone types, is in edging a pond.
6. The seat stone
A flat-topped stone about 45cm off the ground is a bench nobody has to paint. Put it facing the best view, ideally with morning sun and afternoon shade, and set it on a firm base so it never rocks. Two flat-topped boulders side by side read as a bench. A wide slab on two buried uprights reads as furniture, which is fine if that is the look you want.
7. The front garden marker
One upright stone at the end of the drive, or a low group at the corner where cars keep clipping the lawn. In a gravel front garden the stone gives the eye somewhere to land, and it does the job of a bollard without looking like one. Keep it to one upright or an odd group, never a matched pair either side of the drive, which reads as gateposts. More front garden layouts are in 10 front garden ideas.
8. One stone in a small garden
In a small plot, one stone the size of an armchair beats five the size of a football. Bury it, plant round it, and put the seat beside it. The mistake in small gardens is scattering small rocks about to be safe, which reads as rubble. One big stone reads as a decision. If the plot is a corner or a strip beside a path, the layouts in 16 small rockery ideas show how to build round it.
What rock looks best for landscaping?
The rock that looks best for landscaping is generally the one quarried nearest to you, in one type and mixed sizes. Local stone somehow just matches – from everything living right through to the soil colour. It is also usually cheaper because you are not paying to haul something this heavy across the country. After that, the choice is colour and character.
| Stone | Colour | Character | Suits |
|---|---|---|---|
| Sandstone | Buff, brown, some pink | Layered, softens with age | Cottage beds, outcrops, slopes |
| Cotswold limestone | Cream to pale gold, greys with weather | Rounded, grows moss fast | Gravel gardens, front gardens |
| Granite | Grey, pink, near black | Hard, dense, keeps its colour | Modern schemes, seats, water |
| Slate | Blue-grey, plum, green | Flat, angular, splits in layers | Contemporary beds, dry streams |
| Quartz | White to cream | Bright, glitters wet | Dark corners, contrast in shade |
Shape matters as much as type. Rounded, chunky stone sits well beside gravel and water. Low, flat stone reads as a ledge and doubles as a seat or a step. Tall, upright stone brings height and works as a marker. One stone type in mixed sizes beats three types in one size, every time. If the garden already has walls, paving or gravel in it, match that stone rather than bringing in a fourth colour. Slate is the one with its own colour range, and the slate rockery ideas page covers it.
How much do large rocks weigh and cost?
Garden boulders run from about 45kg, which goes on a trolley, up to about 1,400kg, which needs a machine, and they are sold by the tonne whether you buy one stone, a pallet or a lorry load. A stone that needs a crane costs a lorry, a driver and the crane as well as the rock.
Three ways to keep the cost down:
- Buy stone quarried near you. Haulage is a big share of the price of anything this heavy, and local rock looks right for the area anyway.
- Ask any builder working on your house to put aside what comes up. Footings and drains turn up boulders the builder would otherwise pay to skip.
- Turn down anything that flakes at the corners as you handle it, especially stone glittering with mica. It weathers badly and you pay for it twice.
We do not list boulders online, because every one is different, but we have excellent sources. If you want a particular size, colour or number, contact us with the job and we will find it.
How do you move a large rock into place?
A large rock gets moved by machine to the nearest point a lorry can reach, and by boards, rollers and patience from there. The delivery is the part to sort first, because a stone put down in the wrong place is a second job.
Before ordering, walk the route from the road to where the stone will sit. Most boulders arrive on a lorry with a crane arm or pallet truck, and the driver sets the stone down within reach of the arm, not at the far end of the garden. A load never goes down on the public road without the council’s say-so, and not in a wet week if you can help it, because the stone can arrive plastered in mud.
On site:
- Anything over about 25kg goes on wheels, a broad-tyred trolley over timber boards, and never in a wheelbarrow. The trolley rule, the boots and the gloves are in the rockery garden guide, so I will not repeat them here.
- A rounded stone can be rolled. A flat or blocky one can be walked on its corners, the way you shuffle a fridge across a kitchen.
- A crow bar and a wooden block lift one edge enough to slide a board or a roller underneath.
- Two on the stone, one stood back calling it. The third person is the one who stops the accident.
- When two people cannot rock it at all, stop. That is a mini digger for the day, or a landscaper to do just the stonework, and you plant it yourself afterwards.
How do you set a large rock so it stays put?
A large rock stays put when it sits in a hole, on a firm base, with a third to a half of its height below the surface. On soft soil it leans within a winter. On hard soil it floats.
- Look at the stone from all sides and pick its best face and its most stable underside. They are rarely at the same end.
- Dig a hole a little wider than the stone and a third to a half of its height deep.
- On soft or clay ground, put 5 to 10cm of compacted crushed stone in the base so it cannot sink. Where the stone will be sat on, a stiff mix of gravel and a little cement under it stops it shifting.
- Lower it in, best face out, and pack the soil back hard so there is no gap under the overhang.
- Stand back 10m and look, then look from the kitchen window, then adjust.
- Wait about two weeks and top up where the soil has settled before you plant.
PRO TIP: set a flat stone very low, with only its top showing, a short way from the main group. The eye reads it as the top of something far bigger under the ground.
What should you plant around large rocks?
Plant the edges of a large rock, not the top. The soil pockets against the stone stay damper than the open bed, and the rock holds warmth into the evening, so things grow at its foot that would sulk a metre away.
- Something low and spreading at the foot to soften the join: creeping thyme (Thymus serpyllum), stonecrop (Sedum) and houseleeks (Sempervivum) on the sunny side.
- One upright accent against the mass of the rock. A grass or an iris, not a row of them.
- In shade, ferns, moss and small ivies in the crevices instead.
- Larger shrubs behind, never in front, so they frame the stone rather than hide it.
The one thing to avoid is a ring. A circle of the same plant round a rock, or a ring of small rocks round a plant, is the giveaway that somebody arranged it. For the alpines that suit this kind of spot, the rockery plants guide has the list.
Should you keep a large rock that is already in the garden?
A rock already in the garden is nearly always worth keeping, and bedrock showing through a lawn is not a rock at all but the top of something that carries on down. Breaking that out means drilling, a splitting compound or a breaker, somewhere to put the spoil, and often a shaken wall next door.
Treat an inherited stone as free feature stone that has already been delivered. Strip the thin turf off it, sharpen the soil round it with grit, and plant the pockets. Where it is bedrock, use the free drainage: shape a bed round it and mound soil against it. A rock garden built round a stone the site gave you is one of the styles in the rockery garden guide, and it is the cheapest one.
Next steps
We can source feature stone to a brief: contact us with the size, colour and number you want. What we stock is everything that goes round it, and rocks in landscaping sets out which size of stone does which job. The decorative stone range covers the chippings and gravel for dressing the base, and the gravel calculator turns an area into tonnes. Once the stone has weathered a few seasons, there is a separate guide to cleaning large garden stones.
If you would rather talk your rock sizes and delivery through with a person, ring Outdoor Aggregates on 0330 043 7585. The office is open 7am to 7pm, seven days a week.
Have you ever set a large rock or a boulder in your garden? What did it weigh, and how did you get it from the road to the hole? Let us know in the comments.
FAQs
How deep should you bury a large garden rock?
A large garden rock wants a third to a half of its height below ground, enough that the ground meets it at its widest point and nothing shows underneath. Less than that and it reads as delivered.
Can you move a large rock without machinery?
A large rock can be moved without machinery by rolling a rounded one, or walking a flat one on its corners, over timber boards with a pry bar to lift each edge. The point to stop and hire is when two people cannot rock it at all.
How many large rocks should you group together?
Large rocks group best in odd numbers, three or five, with two set close together and the third a stride away. One on its own reads as an obstacle, and a matched pair reads as gateposts.
How do you use large stones in a small garden?
Large stones in a small garden work as one big stone rather than several small ones, buried a third to a half deep, planted round the base and sat next to the seat so it is used, not just looked at.