Choosing the correct corten steel landscape edging is not simply a matter of selecting the thickest steel available. Height determines how effectively the edging separates or retains landscape materials, thickness controls rigidity and resistance to deformation, while section length affects the number of joints, installation efficiency and the ability to form curves.
For most residential lawns, flower beds and gravel paths, corten steel edging is commonly available in heights of approximately 100–200 mm, thicknesses around 2–3 mm, and section lengths from 1.2 to 2.4 m.
Heavy commercial landscape systems may use 4–10 mm steel, longer anchoring stakes or concrete fixing where greater lateral loads are expected.
Recommended Corten Steel Edging Sizes by Application
| Application | Recommended Height | Thickness | Typical Length | Recommended Fixing |
|---|---|---|---|---|
| Lawn and flower bed | 100–150 mm | 2–3 mm | 1.2–2.4 m | 300 mm stakes, typically 600–750 mm spacing |
| Curved flower bed | 100–150 mm | 1.5–3 mm | 1.0–1.5 m preferred | Stakes at 400–600 mm spacing |
| Gravel or mulch path | 150–200 mm | 3 mm | 1.2–2.4 m | 300–400 mm stakes + connectors |
| Deep planting border | 200–300 mm | 3–5 mm | 2–3 m | 400–600 mm anchors / reinforced joints |
| Paving / hardscape separation | 100–150 mm | 4–6 mm | 2–3 m | Heavy stakes or concrete anchoring |
| Commercial heavy-duty edge | 150–300 mm | 6–10 mm | 2–3 m | 450–600 mm anchors / concrete fixing |
| Raised planter | 300–600 mm | 4–8 mm* | Custom | Brackets, returns, welded reinforcement |
| Retaining application | 600 mm+ | By engineering design | Custom | Structural foundation and anchors |
*The table provides practical selection ranges rather than a structural design standard. Actual thickness, anchor spacing and reinforcement must be determined according to soil pressure, exposed height, traffic load and site conditions.
How to Choose Corten Steel Edging Height
100 mm: Lawn and Decorative Borders
A 100 mm corten steel landscape edging profile is suitable for simple lawn separation, shallow flower beds and decorative landscape lines.
Part of the steel should normally remain below ground, so a 100 mm strip is primarily a boundary rather than a soil-retaining structure.
Typical applications: lawn-to-flower-bed separation, decorative planting areas, tree surrounds and shallow gravel boundaries.
150 mm: The Most Versatile Landscape Height
For many residential and commercial landscaping projects, 150 mm is one of the most versatile corten steel edging sizes.
It provides greater burial depth than a 100 mm edge while still leaving sufficient visible height to contain gravel, bark mulch or soil.
A current commercial garden edging system, for example, uses 150 mm height with 2–3 mm steel and approximately 305 mm stakes, while other systems use 300–400 mm stakes for comparable profiles.
200–300 mm: Deep Beds and Architectural Borders
When the edging needs to contain deeper planting soil or create a more visible architectural boundary, 200–300 mm height can be considered.
At this height, thickness and anchoring become more important because lateral soil pressure increases as the exposed retaining height increases.
For a simple 200 mm garden edge, approximately 3 mm steel may be adequate when much of the strip is embedded and properly staked. If the same 200–300 mm plate is expected to retain significant compacted soil, thicker material, closer anchors or a formed profile should be considered.
How to Choose Corten Steel Edging Thickness
1.5–2 mm: Flexible Landscape Edging
Thin edging around 1.5–2 mm is useful where flexibility is more important than high rigidity.
It works particularly well for:
curved flower beds, circular planting areas, garden paths and decorative lawn borders.
Because thinner steel bends more easily, it can follow smooth landscape curves with fewer prefabricated sections.
However, it should not normally be selected as heavy duty steel landscape edging where significant soil, pavement or vehicle loads are present.
3 mm: General Landscape Use
A 3 mm corten steel landscape edging profile provides a useful balance between rigidity and formability.
Current commercial products use 3 mm weathering steel for 100, 150 and 200 mm heights, with 1.2 m and 2.4 m section lengths and approximately 300 mm folded stakes.
This makes 3 mm suitable for:
lawns, flower beds, gravel paths, garden borders and moderate curved landscaping.
4–5 mm: Heavy Landscape and Hardscape
For hard landscaping, paving boundaries, deeper flower beds or areas subjected to greater lateral force, 4–5 mm steel provides considerably more rigidity.
Heavy-duty landscape products are available with approximately 100–250 mm heights and 4–5 mm thickness, using anchoring pegs up to around 600 mm long or concrete fixing.
This range is useful when specifying heavy duty steel landscape edging without moving into a full structural retaining-wall system.
6–10 mm: Heavy Duty Steel Landscape Edging
Where edging is installed beside hard paving, asphalt, commercial pedestrian areas or other high-load landscape zones, a heavier profile may be required.
Commercial heavy duty steel landscape edging systems are available in 3, 6, 8 and 10 mm thicknesses, with 150 mm profiles, 3 m lengths and approximately 450 mm fixing stakes.
However, increasing thickness alone does not automatically make an edging system structurally safe. Load transfer, anchors, foundations and soil conditions must also be considered.
3. How to Choose the Length of Corten Steel Edging
Commercial corten steel edging sizes vary by supplier, but common section lengths include approximately 1.2 m, 2.0 m, 2.4 m and 3.0 m.
For long straight landscape boundaries, longer sections are generally better because they reduce the number of visible joints.
For example, a 24 m straight border requires:
20 sections when using 1.2 m lengths;
10 sections when using 2.4 m lengths;
only 8 sections when using 3 m lengths.
Fewer joints can improve alignment and reduce installation time.
However, shorter sections are often easier to transport, handle and form around curved landscapes.
A Simple Selection Example for Weatheing Steel Edging
Suppose a landscape contractor is building a 30 m gravel path border.
The edging needs to retain approximately 70–100 mm of gravel while maintaining a clean straight line.
A practical starting specification could be:
- Height: 150 mm
- Thickness: 3 mm
- Length: 2.4 m
- Stake: approximately 300–400 mm
- Stake spacing: approximately 600 mm
- Material: weathering steel landscape edging
Required number of sections:
30 ÷ 2.4 = 12.5 sections.
Including approximately 8% allowance:
12.5 × 1.08 = 13.5
Therefore, approximately 14 sections should be prepared.
Custom Corten Steel Landscape Edging
Not every landscape project fits standard corten steel edging sizes.
We can supply corten steel landscape edging in different heights, thicknesses and lengths according to project drawings, including:
straight edging, curved edging, circular edging, pre-bent corners, heavy duty steel landscape edging, welded raised-bed panels, connector plates, fixing stakes and project-specific fabricated sections.
Laser cutting, bending, rolling, welding, drilling and pre-weathered surface treatment can also be supplied according to project requirements.
If the project involves high retaining loads, vehicle traffic or significant elevation differences, dimensions should first be reviewed against the structural requirements instead of simply increasing steel thickness.
f you are purchasing corten steel landscape edging or heavy duty steel landscape edging, send us your:
total perimeter, required height, thickness, section length, straight or curved design, minimum curve radius, fixing method, quantity and project drawings.
We can recommend suitable corten steel edging sizes and provide cutting, bending, rolling, welding, stakes, connectors and custom fabrication according to the application.
