Concrete garden edging is made by setting forms, mixing concrete, pouring a compact border, then curing it for several days.
If you want a clean line between lawn and beds that can handle mowers, feet and rain, concrete edging is hard to beat in most home gardens. It lasts for years, keeps mulch where it belongs and gives paths and borders a tidy frame.
This walkthrough keeps the steps clear and realistic so a handy homeowner can finish a weekend project without drama. You will learn how to plan the shape, set up sturdy forms, mix a lean concrete blend that suits kerbs and borders, and finish the edge so it stays smart rather than crumbling or cracking.
Tools And Materials For Concrete Garden Edging
Before you start digging, pull your kit together. Having every tool laid out saves time and stops rushed choices once the concrete is wet. Use this list as a checklist and adjust it to suit the length of your border.
| Item | Purpose | Practical Tip |
|---|---|---|
| String Line And Pegs | Mark straight runs and gentle curves | Set at the finished height of the edging |
| Spade And Trenching Spade | Cut turf and dig the trench | Keep one clean for trimming the top edge |
| Timber Boards Or Flexible Edging Forms | Shape and contain the concrete | Use 50–100 mm deep boards for most garden borders |
| Timber Stakes And Screws | Brace the boards firmly | Place stakes every 60–90 cm so the forms cannot move |
| Cement, Sharp Sand And Gravel | Make the concrete mix | A lean mix around 1:5 cement to sand and gravel suits kerbs |
| Wheelbarrow And Mixing Hoe | Mix and move the concrete | Work near the trench to cut down on lifting |
| Trowel, Float And Edging Tool | Level and smooth the surface | Use a small trowel for control joints |
| Gloves, Boots And Eye Protection | Basic safety kit | Cement is caustic so cover skin and eyes |
Planning Your Concrete Garden Edging Line
Good planning makes the rest of the work feel steady rather than rushed. Start by deciding what your edging needs to do. Are you separating lawn from a mixed border, containing gravel beside a path, or framing a vegetable bed with low walls?
Walk the route and mark it with a hose or string. Straight edges feel formal and highlight strong lines in a plot. Curves soften long fences and can guide the eye towards a focal point such as a tree, bench or water feature. The Royal Horticultural Society shares clear advice on shaping borders, while its notes on creating a lawn edge are handy when you want a crisp line beside grass.
How To Make Concrete Garden Edging Step By Step
The phrase how to make concrete garden edging often sounds like something that belongs on a contractor’s quote. In reality the process breaks down into simple stages. Take your time on each stage rather than racing towards the pour.
Step 1: Set Out And Dig The Trench
Run a tight string line along the planned edge at the finished top height of the border, then cut any turf along the line with a half moon edging tool or sharp spade. Lift the turf in strips and stack it to re use elsewhere. Dig a trench that is a little wider than the planned edging and deep enough to allow for a compacted base plus the concrete thickness, roughly 150 mm for most lightweight garden borders, and remove roots, large stones and soft patches so the base feels solid underfoot.
Step 2: Build Strong Forms
Forms are your temporary mould, so take a moment to get them right. Fix timber boards or flexible edging forms inside the trench so the top edge sits at the height you marked earlier, then push stakes in on the outside face and screw the boards to the stakes. Check the level with a spirit level resting on a straight timber offcut, and for curves use thin boards or plastic forms, stepping back often to spot kinks while they are still easy to correct.
Step 3: Mix The Concrete
For garden edging you need a mix that is strong but not over rich in cement. A lean blend with roughly one part cement to five parts combined sand and gravel works well for kerbs and narrow borders, matching typical lean concrete mixing advice for small structures. Add clean water gradually and fold the mix until every grain is damp but not soupy so it holds its shape when squeezed in a gloved hand without slumping flat.
When handling cement and wet concrete, protect skin and eyes. Wear sturdy gloves, long sleeves and boots with good grip, and rinse splashes on bare skin straight away since fresh cement paste is strongly alkaline.
Step 4: Place And Compact The Concrete
Shovel concrete into the forms in short sections, using a shovel or small tamper to push mix into the corners and against the form faces. Level the surface with a straight piece of timber dragged along the top of the forms, sawing the board back and forth slightly as you pull so low spots fill, then smooth the top with a float and, if you like, round the top edges with an edging tool for a softer look that is kinder on mower wheels and ankles.
Step 5: Cut Control Joints
Concrete shrinks as it dries, so giving it controlled weak points keeps random cracking under control. Before the mix stiffens, use the edge of a trowel or a grooving tool to cut joints across the strip, pressing the blade down to around one third of the strip depth and spacing joints roughly every 60–120 cm so any hairline cracks that form later will stay tucked neatly in the joint rather than crossing the surface.
Step 6: Cure The Concrete Properly
Fresh concrete needs moisture and time to gain strength. As soon as the surface is firm enough to touch, cover it with plastic sheeting or damp hessian held in place with boards or bricks, sealing the edges so wind does not lift the cover and dry the surface. Keep the cover in place for at least three days in mild weather and up to a week in hot, dry or windy spells, and avoid walking on the edging until curing time has passed so the strip stays level and strong.
Once curing time has passed, remove the forms carefully. Backfill any gaps along the sides with topsoil or gravel and firm it with your boot. At this point you can trim the lawn edge against the new concrete and dress the beds with mulch or fresh planting.
Finishing Touches And Design Ideas
After the structural work, you can give the edging character so it suits the rest of the garden. Soft grey concrete blends nicely with informal planting, while a broomed texture on top adds grip on damp days. For a crisper look, keep the top smooth and straight and plant low groundcover right against the inside edge.
Coloured or stamped finishes are another option. Pigments designed for concrete can be mixed in during batching or dusted on the surface and trowelled in, and stamps pressed into the surface before it hardens can mimic stone or brick. If you prefer to keep the edging plain, you can still add interest by pairing it with contrasting materials such as gravel, bark or dense planting.
Common Mistakes With Concrete Garden Edging
Planning how to make concrete garden edging does not stop once the trench is dug. Many problems trace back to choices made early in the project. Knowing the usual traps makes it easier to avoid them.
| Problem | Likely Cause | Better Approach Next Time |
|---|---|---|
| Random Cracks Across The Strip | No control joints or joints spaced too far apart | Cut joints every 60–120 cm while the concrete is still workable |
| Edging That Tilts Or Sinks | Poorly compacted base or soft soil below the trench | Add and compact a gravel layer before pouring the concrete |
| Rough, Flaky Surface | Too much water in the mix or finishing before bleed water evaporates | Use a stiffer mix and wait until the sheen has gone before trowelling |
| Water Pooling Against Buildings | Edging laid level or sloping towards structures | Build a slight fall away from walls to shed rainwater |
| Uneven Height Along The Run | Forms set to mixed levels or moved during pouring | Brace forms firmly and keep checking level as you place concrete |
| Damaged Lawn Edge Beside The Border | Heavy barrows or feet trampling wet turf | Lay boards on the grass and limit traffic while work is underway |
When Concrete Edging Is The Right Choice
Concrete edging suits beds and paths that see regular wear and tear. It copes well with wheeled traffic, stray roots and repeated trimming along the lawn edge. In damp climates, a well raised border can also improve drainage by lifting soil slightly above surrounding ground.
There are times when another edging type works better. Flexible metal or timber strips are quicker to install where lines change often, and loose gravel strips can be kind to tree roots that dislike heavy concrete. Approached steadily, this project gives you a sturdy border that tidies paths and planting while cutting down on edging chores.