How to Install Plastic Lawn Edging | Clean Borders That Last

Installing plastic lawn edging requires digging a 3–6 inch trench, setting the edging so the top bead sits half an inch above grade, backfilling tightly, and staking every 3–4 feet at a 45-degree angle.

A crisp border between lawn and garden bed is one of those details that makes a yard look cared-for — and plastic edging is the most practical way to get it without renting a trencher or mixing concrete. The trick is that a weekend’s worth of work either locks the edge in place for years or leaves it popping up after every rain, depending on the steps you follow. Here is the exact procedure that manufacturers like Master Mark and Vigoro document, with the details that separate a lasting install from a frustrating one.

Tools and Materials You Will Need

Gather everything before you start so the trench stays open as short a time as possible. The hardware is simple, and the edging itself is surprisingly affordable.

• Edging: Coiled plastic edging (usually black) in 20 ft, 60 ft, or 100 ft rolls — Master Mark Classic Edging and Vigoro are the most common brands at Home Depot and Lowe’s. A 20-foot roll runs roughly $15–$20; 100-foot rolls land around $40–$60.
• Stakes: Landscape stakes (plastic or steel), sold in 10-packs for about $8–$12. Master Mark and Oly-Ola both supply stakes with their edging, but you will want extras for curves and joints.
• Connectors: Straight couplers for joining strips end-to-end, and corner connectors if you plan 90-degree turns. Master Mark uses a channel-slide coupler; Vigoro uses a top-channel slide coupler.
• Tools: Round-point shovel or spade, tin snips or a hacksaw for cutting, rubber mallet, garden hose or rope for layout, marking paint, safety glasses, and heavy-duty garden shears.

Measure and Mark the Border

Lay a garden hose or rope along the exact line you want the border to take. Stand back and look at it from the house and the street — adjust the curve until it looks natural, then trace the line with environmentally safe marking paint. Add roughly 10 percent to the measured length to account for waste and adjustments.

Let the Edging Acclimate to the Sun

Plastic edging arrives tightly coiled and resists straightening if you unroll it cold. Uncoil it 1–2 days before installation and let it relax in direct sunlight. The time needed depends on temperature: below 65°F in direct sun, plan for two days; at 65–75°F, about eight hours; above 75°F, three to four hours is enough. If the edging is still kinked when you try to bend it around a curve, stop and let it warm longer — forcing it creates permanent creases.

Dig the Trench the Right Way

Use a round-point shovel to dig a trench 3–6 inches deep along the painted line. The two walls of the trench should be different shapes: the side facing the lawn must be nearly vertical — that vertical wall is what keeps grass roots from crossing the border. The side facing the garden bed should slope at about 45 degrees. A trench that is too shallow keeps the edging from seating properly; one that is too wide lets it wobble in the hole. If your edging is 2.5 inches tall, dig at least 3 inches deep so the top bead sits about half an inch above grade.

Position and Join the Edging Sections

Place the edging into the trench with the bottom V-shaped lip pointing toward the rocks or mulch (away from the lawn). Each section connects to the next using the brand’s coupler — slide the coupler halfway into the top channel of the first strip, pinch to hold it, then slide the second strip onto the exposed half of the coupler. Join strips in the middle of a straight run, not near a corner or tight bend, because seams at curves are harder to hide and more likely to separate. For right-angle turns, use a dedicated corner connector instead of trying to force the edging to bend 90 degrees.

Backfill and Tamp Firmly

Push the saved soil back into the trench, forcing the edging against the vertical lawn-side wall. Pack the dirt down with your boot — stomp firmly, then stomp again — and keep the soil slightly higher than the surrounding grade to account for natural settling. This step is where most installations fail: loose backfill lets the edging shift under the first heavy rain, and once it tilts, grass roots find the gap. If you have a better look at tested lawn edging products before buying, our roundup covers the options that hold up longest in US climates.

Secure with Stakes at the Correct Angle

Drive landscape stakes every 3–4 feet along the run, plus extra stakes at every joint and on the inside of curves. The angle matters: drive each stake at 45 degrees from the lower outside face of the edging, through to the other side. A vertical stake pulls out easily when soil freezes and thaws; a 45-degree stake locks the edging in place against both lateral and upward forces. Use a rubber mallet to avoid bending steel stakes or cracking plastic ones. The top of each stake should be flush with or slightly below the top bead of the edging so it is not visible.

Finish and Test the Installation

Water the backfilled trench lightly to settle the soil, then rake the surface for a smooth transition between lawn and bed. Add mulch, gravel, or decorative stone to the garden side — the V-shaped lip will help hold it in place. Walk the entire border and check that the top bead is consistently about half an inch above grade. If any section sits lower or higher, pull the nearest stake, adjust the edging, and re-drive the stake.

What About Curves and Tight Corners?

Flexible plastic edging is actually better at smooth, sweeping curves than at sharp corners. For gradual bends, the warmed edging will follow the trench naturally with a stake every 2–3 feet on the inside of the curve to hold the arc. For 90-degree turns, use the brand’s corner connector — forcing the edging to bend at a right angle without a connector creates a flat spot that grass can crawl over. Corners are also the place to dig the trench a hair deeper so the edging seats fully at the turn.

Checklist for a Lasting Plastic Edging Install

1. Lay out the border with a hose and mark it with paint — adjust until the curve looks right from the house.
2. Uncoil edging in direct sun for the time required by your temperature.
3. Dig a trench with a vertical wall on the lawn side and a 45-degree wall on the garden side.
4. Set the edging so the top bead is exactly half an inch above grade.
5. Join sections in straight runs only, using the brand’s coupler.
6. Backfill and stomp the soil until it is firmer than the surrounding ground.
7. Drive stakes at 45 degrees every 3–4 feet, plus extras at joints and curves.
8. Water lightly, rake smooth, and add mulch to the bed side.