How to Install Landscape Edging: Clean Borders

Nothing makes a yard look more cared-for than a crisp line between lawn and bed. Edging does two jobs: it draws that clean visual border and it physically stops grass roots and mulch from migrating where they don’t belong. There are half a dozen edging materials, each with a different look, price, and install method. This guide covers how to choose, then how to install the most common types — from a free spade-cut edge to steel and paver borders that last decades.

Part of our Lawn Care guide →

In this guide

1. Choosing an edging material
2. Tools and materials
3. Step 1: Lay out the line
4. Step 2: Dig the trench
5. Step 3a: Install steel or aluminum edging
6. Step 3b: Install plastic/poly edging
7. Step 3c: Install a paver or brick border
8. Step 4: Finish the bed
9. Maintenance
10. Common mistakes to avoid
11. Cost ballpark
12. Frequently Asked Questions
13. Featured project by Gensou Aquascaping

Choosing an edging material

• Spade-cut (trench) edge: A V-shaped trench cut with a half-moon edger. Free, natural-looking, but must be re-cut each season.
• Plastic/poly edging: Coiled rolls with a rounded top bead and stakes. Cheapest manufactured option (~$0.50-$1.50/ft); fine for casual beds but can heave and look wavy.
• Steel or aluminum: Thin metal strips staked vertically. The cleanest, most professional line; bends to curves; nearly invisible. ~$2-$5/ft.
• Paver or brick: A row of bricks or pavers set in a trench. Durable, mow-over friendly if set flush, more labor. ~$3-$8/ft.
• Natural stone or concrete edgers: Decorative, heavy, good for informal looks. Variable cost.

Tools and materials

• Tools: half-moon edger or sharp flat spade, trenching shovel, rubber mallet, garden hose or rope (to lay out curves), tape measure, level, utility knife (for plastic), hand tamper for paver edges.
• Materials: your chosen edging, stakes/spikes as required, plus crushed stone and bedding sand if you’re setting a paver border.

Matching edging to the job

Think about what the edging actually needs to do before you buy. To hold back loose mulch or gravel, almost any raised edging works. To stop aggressive turf — Bermuda or quackgrass that spreads by underground runners — you want a continuous physical barrier set deep, at least 4-5 inches below grade, since shallow edging just gets jumped by rhizomes. To create a mow-over strip that eliminates string-trimming, only a flush paver or steel edge set level with the lawn will do. And if the look matters more than function, natural stone or concrete edgers carry an informal cottage feel that thin steel can’t. Buying the cheapest plastic for a job that needed a root barrier is the most common regret, so match the material to the problem.

Step 1: Lay out the line

Use a garden hose or rope to shape the border on the ground until the curve looks right — step back and view it from the house and street. Sweeping, gentle curves read better than fussy wiggles and are far easier to mow around. Mark the line with marking paint, then remove the hose. Lay the hose out in the morning sun for an hour first if you’ll also use it as plastic edging stock — and either way, measure the final line with a tape so you can buy the right footage plus about 10 percent for waste, splices, and curves.

Step 2: Dig the trench

Cut along your line with the half-moon edger or spade. For a spade edge, slice straight down 4-6 inches on the lawn side, then cut at an angle from the bed side to remove a wedge of sod, leaving a clean vertical wall facing the grass. For manufactured edging, dig a trench deep enough that the edging’s top sits at the height you want — typically flush with the soil or about 1/2 inch above, so a mower wheel can ride over it. Steel edging usually wants a trench about as deep as the strip is tall, minus the small lip you leave exposed.

Step 3a: Install steel or aluminum edging

Set the metal strip into the trench against the vertical lawn-side wall. Connect sections with the supplied splice tabs so the line stays continuous. Drive the included stakes through the slots into the soil, angled inward, every 2-3 feet (closer on tight curves). Tap the top with a mallet to set it to a consistent height — leave only about 1/2 inch exposed so it disappears and won’t catch the mower. Backfill both sides and tamp.

Step 3b: Install plastic/poly edging

Let the coil relax in the sun for an hour so it uncurls and lies flat. Set it in the trench with the rounded bead at soil level, then drive the anchor stakes through the bottom flange at a downward angle every couple of feet. Angling the stakes toward the bed resists frost heave, the classic failure that lifts plastic edging into a wavy mess. Backfill and firm both sides.

Step 3c: Install a paver or brick border

For a mow-over paver edge, dig the trench a few inches deeper, add 2 inches of crushed stone, then about 1 inch of bedding sand, and tamp. Set each paver into the sand and seat it with the mallet so the tops are level with the lawn — a string line keeps the run straight and level. Setting the pavers flush lets you run a mower wheel right along them and skip the string-trimming. Sweep sand into the joints and tamp again.

Step 3d: Install a spade-cut (trench) edge

The no-cost option deserves its own method because, done well, it rivals steel for crispness. Hold the half-moon edger vertical and step it straight down 4-6 inches along your painted line, working in overlapping bites so the cut is continuous, not scalloped. Then come in from the bed side at roughly a 45-degree angle and slice out a wedge of soil, leaving a clean vertical wall facing the lawn and a sloped gutter on the bed side. That little trench gutter is what catches stray mulch and gives the eye a defined shadow line. Pull the loose sod and soil into the bed or compost it. The whole thing reads as professional, and the only cost is re-cutting it two or three times a season.

Handling curves and corners

Steel and plastic bend to gentle curves easily; for tight radii, make small relief cuts in the bottom flange of plastic with a utility knife. For paver borders on a curve, use smaller units (like brick on end) so the joints stay tight, or accept slightly wider joints filled with sand. For crisp 90-degree corners in steel edging, most systems sell a pre-bent corner piece, or you can carefully notch and fold the strip; avoid trying to bend a sharp corner freehand, which kinks and bulges the metal.

Step 4: Finish the bed

Backfill and tamp soil on both sides so the edging is firmly held and no gaps remain. Add 2-3 inches of mulch on the bed side, kept just below the edging top so it doesn’t wash over onto the lawn. Stand back and check the line from a distance before you call it done.

Maintenance

• Spade edges: re-cut 2-3 times per growing season as grass creeps back.
• Steel/paver: essentially maintenance-free; occasionally tap down any frost-lifted section in spring.
• Plastic: re-stake any heaved spots each spring; it’s the type most prone to lifting.
• Keep mulch topped up so the visual line between lawn and bed stays sharp.

Common mistakes to avoid

• Setting edging too high. A lip standing more than about 1/2 inch proud catches the mower deck and trips people. Keep it flush to just barely proud.
• Under-staking. Stakes every 4-5 feet aren’t enough; go every 2-3 feet and closer on curves, or frost will lift it.
• Driving stakes straight down. Angle them toward the bed so they resist the upward pull of heaving soil.
• Choosing thin plastic for an aggressive lawn. Shallow edging won’t stop spreading turf — use a deep continuous barrier or steel.
• Letting mulch pile over the top. It washes onto the lawn and blurs the very line you installed the edging to create.

Cost ballpark

A spade-cut edge costs nothing but a sharp tool and your time. Plastic edging runs about $0.50-$1.50 per linear foot, steel or aluminum $2-$5, and a paver border $3-$8 once you include base and sand. For a typical 60-foot bed border, that’s roughly $0 (spade), $30-$90 (plastic), $120-$300 (steel), or $180-$480 (paver) in materials. A pro install typically doubles or triples those figures once labor is added, so edging is one of the highest-value DIY landscaping jobs — most of the cost is your afternoon, not the material.

A paver border uses the same base-and-sand technique as a full patio — see our guide on how to lay pavers. Crisp edging is the finishing touch around hardscape projects like a DIY fire pit, and you’ll find more border and bed projects in the Outdoor Living hub.

Featured project by Gensou Aquascaping