What Is Landscape Edging (Depth Chart)

Landscape edging is a border that separates areas such as a lawn and a garden bed, or helps hold paving in place. Its depth depends on its job and material. As a starting point, many plastic and metal lawn edges are buried 4–6 inches, with the top usually flush to about ½ inch above the nearby ground. Always check the product instructions.

A garden border should define the bed, not become a surprise speed bump for a mower. The tricky part is that “edging depth” can mean how much of the edging goes underground, how tall it stands above the soil, or how deep a trench must be. Those measurements are related, but they are not interchangeable.

Choosing Edging Depth and Preparing the Site Safely

Edging depth is the portion below the finished ground surface. Choose it based on the job, the edging product, and the site, rather than relying on one depth for every border. Before digging, check the product instructions, decide where the finished top will sit, and locate buried utilities and private lines.

Landscape edging depth chart

This chart gives starting ranges, not universal specifications. “Buried depth” means the portion below the finished soil or lawn grade. A product’s instructions, soil conditions, and intended use may call for a different installation.

For lawn edging, the top is typically set flush with the soil or up to about ½ inch (13 mm) above adjacent grade. A taller lip may catch mower equipment, interfere with trimming, or create a trip hazard. Do not assume that deeper burial alone makes an edging product suitable for retaining pavers or blocking roots.

Match depth to the job

Lawn and bed separation is usually about creating a clear boundary and limiting grass from creeping into the bed. Paver restraint has a different task: it helps hold the paving edge, so its required depth and base detail come from the restraint product. A root barrier also has its own purpose and may need to extend much deeper than ordinary lawn edging.

When I explain edging depth to homeowners, I start by asking what the border must hold back. That question often clears up the confusion. A shallow decorative divider, a paver restraint, and a barrier intended to redirect roots are not interchangeable, even if they all look like strips at ground level.

Check the site before excavation

Mark the proposed line and inspect the ground. Plan for drainage, mower-wheel access, and a clean path for a trimmer. Make sure the edging will not block a route where water needs to flow, and check that its planned height will not leave a sharp or raised edge in a walking area.

Before digging, contact the applicable utility-locating service. In the United States, call 811. Also check the routes of private irrigation, landscape lighting, and drainage lines separately; public utility marking may not identify these private systems. Wear gloves and eye protection while handling edging and tools.

Stop work if you find an unmarked line or warning tape. Do not probe, cut, or move it. Contact the utility owner to identify it before continuing. A spade or powered trencher can damage buried electrical, gas, water, or communications lines, creating a risk of serious injury, service disruption, or property damage.

Installing, Aligning, and Backfilling Landscape Edging

A sound installation starts with the required depth and finished height, then follows a simple sequence: mark the line, excavate, set and secure the edging, and backfill. Keep checking the top as you work. A border that looks level at one end can still rise into a mower or walking path farther along.

Mark and excavate the trench

Mark the edging line before cutting. For flexible edging, a trench about 2–3 inches (50–75 mm) wide is a common starting point, but follow the product instructions if they specify another width or a base. Dig only as deep as needed for the selected product and planned finish height.

Cut turf cleanly where the edging meets the lawn. Keep excavated soil clear of marked utilities, and avoid widening or deepening the trench without a reason. Excess excavation can disturb drainage or make it harder to support the edging evenly.

Set, secure, and check the edging

Place the edging so its buried portion meets the product’s required depth and its top sits at the planned finished height. Join sections and install stakes or anchors as directed. Stake spacing varies by product and site. As a practical guide, use closer support at joints and curves than on straight runs, unless the manufacturer gives a different layout.

Check the line and height along the full run before backfilling. Look from both ends and along the lawn side. If the edging bows or rises, correct it while the trench is open rather than trying to hide the problem with soil later.

Backfill and verify access

Return soil around the edging and compact it gently. Firm support helps hold the line, but heavy pressure can bow flexible material. Restore the nearby grade so the edge is not left with a trench, ridge, or exposed lip.

Before routine mowing or trimming, inspect the full border. Confirm that mower wheels can pass as intended and that the finished top does not sit where the blade or trimmer line may strike it. Keep people and equipment clear while checking or correcting the installation.

Installation Examples: How the Depth Chart Applies

These examples show how to use the chart for common jobs; they are planning scenarios, not universal specifications. In each case, the product instructions and actual site conditions set the final depth. The key is to choose edging for its intended function, then set its height and support to suit the location.

Plastic edging beside a lawn

For a flexible plastic edge separating turf from a garden bed, use the chart’s 4–6-inch buried range as a starting point. Check the product directions, then plan a trench wide enough for the edging and backfill; about 2–3 inches is a common starting width. Set the top near flush or no more than about ½ inch above the adjacent grade.

Follow the product’s directions for joining sections and placing stakes. Check the height along curves as well as straight sections. A curve can pull the edging out of line, so closer support may be needed there, depending on the product and soil.

Metal edging along a planting bed

For metal lawn edging, the same 4–6-inch buried range is a starting point, not a guarantee that every profile will fit every site. Read the installation instructions for the specific product. Set the exposed top low enough to avoid equipment contact and trip risk, and confirm that the edge will not obstruct water flow.

Handle metal carefully and follow the manufacturer’s guidance for joining and anchoring it. Recheck the top after backfilling, since soil movement during installation can change the finished height.

Restraining a paver edge

Do not use the lawn-edging depth chart as a paver-restraint specification. Choose a purpose-made restraint and install it at the depth and with the base detail specified by its manufacturer. Paver restraint is meant to support a paving edge, so the required installation can differ from a simple divider between grass and soil.

Before digging, confirm the layout and check for buried utilities. Once installed, verify that the restraint does not leave a raised edge where people walk or equipment passes.

Installing a root barrier

A root barrier may require 10–12 inches (250–300 mm) of depth or more, depending on the roots and site. A shallow barrier may not stop roots from passing beneath it. Select a product and depth for the target roots, and check its instructions rather than assuming ordinary bed edging will do the job.

Inspecting, Repairing, and Maintaining Edges

Landscape edging needs occasional checks because soil and use can change its position. Look for raised sections, gaps, loose anchors, or bowed lines, especially after installation and when you notice a problem. Correcting a small shift early can help keep the border clear of mower wheels, trimmer line, and foot traffic.

Inspect the full run rather than checking only the spot that looks wrong. A raised section may connect to a loose stake or a change in grade nearby. Reset displaced edging according to the product instructions, and restore the surrounding soil without forcing the material out of shape.

If water pools or runs along the border in a way it did not before, check whether the edging or backfill is blocking the drainage path. Do not solve the issue by cutting or altering a product without first checking its instructions and the site conditions. For paver restraint or root barriers, use guidance meant for that product’s purpose.

Protecting Edging Through Seasonal Changes and Storage

Seasonal checks help you spot movement, damaged joins, and changes in grade. After conditions that shift soil, inspect the edging height and anchors before using equipment beside it. There is no single seasonal adjustment for every material or climate, so use the product guidance and watch how the specific installation performs.

Keep spare edging and stakes in the way the manufacturer recommends. Protect stored sections from damage that could bend, crack, or deform them. Before reusing a spare piece, inspect it and confirm that it is suitable for the intended job.

The central rule is simple: choose depth for the edging’s purpose, follow its instructions, and keep the finished top clear of equipment and walking paths.

Frequently Asked Questions

These quick answers cover common questions about landscape edging depth. Use them as general guidance, then confirm the dimensions and installation steps for your specific product. Depth ranges are starting points; they do not replace manufacturer instructions or checks for utilities, drainage, and site conditions.

How deep should landscape edging be buried?
For flexible plastic or metal lawn edging, 4–6 inches (100–150 mm) is a common starting range. Check the product instructions and adjust for the edging’s intended use and site.

How much edging should show above the ground?
The top is typically flush to about ½ inch (13 mm) above nearby grade. Avoid a raised lip that could catch equipment or create a trip hazard.

How wide should the trench be?
For flexible edging, about 2–3 inches (50–75 mm) is a common starting width. Follow the product instructions if they specify a different width or base.

Should landscape edging be level with the lawn?
Often, yes. A flush or slightly raised top can define the border while reducing the chance of equipment contact. Check the whole run, not just one section.

Can I use lawn edging to hold pavers in place?
Do not assume so. Use a purpose-made paver restraint installed to its specified depth and base detail.

How deep should a root barrier go?
A depth of 10–12 inches (250–300 mm) or more may be needed. The right depth depends on the target roots and site; roots can pass below a shallow barrier.

How far apart should edging stakes be?
Follow the manufacturer’s directions. Curves and joints may need closer support than straight sections, but one spacing does not suit every product or soil.

Can edging block drainage?
It can affect water flow if it interrupts an existing drainage path. Plan the layout with drainage in mind, and investigate pooling or changed water flow after installation.

What should I do if I find an unmarked line while digging?
Stop. Do not probe, cut, or move it. Contact the utility owner to identify the line before continuing.

How do I know if the installed depth is right?
Check that the product’s buried portion meets its instructions, the edging is secure, and the top sits at the planned grade. Also verify mower, trimmer, pedestrian, and drainage clearance.

(This article was written by one of our staff writers, Evan Bradley. Visit our Meet the Team page.)