If your beds have lots of sweeping curves, aluminum landscape edging is usually the easier metal to live with: it bends by hand, weighs about a third as much as steel, and never leaves rust stains on a patio. Steel wins where you want maximum rigidity on long straight runs, heavy foot or mower traffic, or a lower material price per foot. Both outlast plastic by a wide margin, and both give that thin, crisp line that makes a lawn look professionally maintained.
The choice comes down to four practical questions: how curvy your layout is, what surface sits next to the edge, how much abuse it will take, and how much you want to spend. Work through those and the right metal is usually obvious.
Aluminum Landscape Edging vs Steel at a Glance
| Factor | Aluminum | Steel |
|---|---|---|
| Weight | Light, easy to carry and cut | Heavy, stiffer to handle |
| Curves | Bends by hand into tight radii | Needs thinner gauge or pre-bent pieces |
| Corrosion | Does not rust; no stains | Painted steel can chip and rust; weathering steel rusts by design |
| Rigidity | Can dent or kink under impact | Very rigid, resists mower strikes |
| Typical cost | Moderate to higher per foot | Lower to moderate per foot |
Weight and handling
Aluminum strips are easy for one person to carry, position and adjust. A 16-foot coil or several 8-foot lengths fit in a car trunk. Steel, especially thicker gauge, is noticeably heavier, which helps it stay put but makes long runs more of a two-person job.
Bending curves
This is aluminum’s biggest advantage. Flexible metal landscape edging made of aluminum can follow tight curves around trees, birdbaths and kidney-shaped beds without special tools. Steel of the same height resists bending; you either buy thinner stock, make relief cuts, or order factory-curved sections. If your design has a lot of flowing lines, aluminum saves time and frustration.
Corrosion and staining
Aluminum forms a thin oxide film that protects it, so it does not rust and will not stain concrete or pavers. Most products come with a powder-coated black, bronze or green finish that hides the metal. Black steel edging is also usually powder coated, and it performs well until the coating chips; bare spots then rust and can leave small stains. Weathering steel rusts on purpose and needs planning to avoid run-off stains near light masonry.
Strength and durability
Steel is stiffer. It shrugs off mower wheels, string trimmers and kids running along it. Aluminum is durable in the ground, but a hard impact can dent or fold the top edge. For borders along a driveway, next to heavy equipment or in high-traffic play areas, steel or a heavier aluminum profile is the safer bet.
Which One Should You Choose?
- Choose aluminum for curving flower beds, borders next to light pavers or pool decks, coastal yards with salt air, and DIY installs where you want lightweight material.
- Choose steel for long straight runs, tall edges holding back gravel or deep mulch, high-traffic areas, and budget-driven projects where rigidity matters more than weight.
- Mix them where it makes sense: steel along the driveway, aluminum around the curvy perennial beds. With matching finishes, the transition is barely visible.
Also consider the soil. In rocky ground, the thinner profile of aluminum drives in easily but can crumple against a buried stone. In soft soil, steel’s weight and stiffness help it hold a line with fewer stakes. Whatever you choose, look for a system with integrated stakes and positive locking connectors; joints are where borders usually fail. Some people search for aluminium landscape edging, the British spelling; the product is the same.
Profiles, Heights and Finishes
Metal edging comes in several profiles. The most common is a flat strip 4 to 5 inches tall with a rolled or folded top edge for safety. Taller strips of 6 to 8 inches work for raised gravel beds, while short 3 inch profiles are enough to separate lawn from mulch. Thickness matters for durability: aluminum strips around 1/8 inch thick hold their shape well, and thinner residential grades are easier to bend but more prone to denting. For steel, 14 gauge is a common homeowner choice, with heavier gauges used on commercial sites.
Finishes are mostly cosmetic but affect how the edge blends in. Black and dark bronze powder coats disappear against mulch and soil, green blends into turf, and mill-finish aluminum ages to a dull gray. With aluminum landscape edging, a scratch in the coating simply exposes gray metal rather than rust, so touch-ups are optional.
Tools and Materials
- Edging strips (aluminum or steel), stakes and connectors. An aluminum landscape edging kit usually bundles all three.
- Garden hose or rope to lay out curves; string line and stakes for straight runs
- Flat spade or half-moon edger and a narrow trenching shovel
- Rubber mallet and a scrap board to protect the top edge
- Hacksaw or tin snips for aluminum; angle grinder with metal cutoff wheel for steel
- Metal file, tape measure and a level
- Gloves, safety glasses and hearing protection when grinding
How to Install Metal Landscape Edging
- Call 811 and locate sprinklers. Mark irrigation lines and any low-voltage lighting cables before you dig.
- Lay out the border. Use a hose for curves and a string line for straight sections. Look at it from the house and from the street before cutting sod.
- Cut the trench. Slice straight down with a flat spade about 3 to 5 inches deep, depending on edge height. Keep the lawn-side wall vertical.
- Place the strip. Set the edging in the trench with the top about 1/2 to 1 inch above the soil on the lawn side. For gravel or mulch beds, leave 1 to 2 inches more on the bed side.
- Form curves. With aluminum, bend gradually by hand along the trench, working a foot at a time. With steel, use the thinnest gauge that fits the job or add relief cuts on the inside of the curve.
- Stake it. Drive stakes through the slots or tabs every 2 to 4 feet, and always at each joint. Tap through a board so you do not deform the top edge.
- Connect sections. Overlap or slide connectors per the kit, keeping the tops flush so there is no step between strips.
- Trim. Cut aluminum with a hacksaw or snips; cut steel with a grinder. File every cut end smooth.
- Backfill and water. Pack soil on both sides, tamp firmly, and water to settle. Top up soil where it sinks.
Troubleshooting
Edge lifting after freeze-thaw. Add longer stakes and tap the edging back down in spring. In cold regions, a deeper trench helps.
Kinks in aluminum. A sharp bend or impact can crease the strip. Gently straighten with a block and mallet; if the crease is severe, replace that section, since a kink weakens the profile.
Chipped coating on steel. Wire brush the spot and touch it up with an exterior metal paint in a matching color before rust spreads.
Grass creeping under or over. The top should sit just above the turf, and the bottom deep enough to cut off runners. Spreading grasses may need edging 5 inches deep or more.
Wobbly joints. Add a stake right at the connector, and use kits with interlocking ends rather than simple overlaps.
Cost Ranges
As general ranges, powder-coated steel edging runs about $2 to $6 per linear foot, and aluminum edging runs about $3 to $8 per linear foot for typical residential profiles. Taller, thicker or specialty finishes cost more. Professional installation generally adds $4 to $12 per linear foot depending on soil, curves and site access. Over a 20 plus year life, either metal typically costs less than repeatedly replacing plastic or wood edging.
When to Call a Pro
Most homeowners can install either metal on a weekend. Consider a landscaper when you have hundreds of feet to cover, compacted clay or rocky soil, borders that must tie into retaining walls or drainage, or edging that must follow grade changes precisely. A pro with a sod cutter and power trencher can finish a large yard in a fraction of the time and will know how to protect irrigation and lighting lines.
Frequently Asked Questions
Is aluminum landscape edging worth the extra cost?
For curved beds, coastal yards and borders next to light masonry, yes. It bends easily, never rusts and will not stain. For long straight runs in high-traffic areas, steel often gives better value.
Does aluminum edging bend easily by hand?
Most residential aluminum profiles can be bent by hand into smooth curves. Work gradually along the trench and avoid sharp creases, which weaken the strip.
Will black steel edging rust?
Powder-coated steel resists rust while the coating is intact. Where it chips, bare metal will rust, so touch up nicks with exterior metal paint.
How far apart should edging stakes be?
Every 2 to 4 feet, plus at every joint. Use closer spacing in soft soil, on curves and in areas prone to frost heave.
Can flexible garden edging hold back gravel?
Yes, if it is tall enough and well staked. Leave 1 to 2 inches of edge above the gravel surface and stake more closely where foot traffic pushes stones outward.
How long does metal landscape edging last?
Aluminum commonly lasts 20 years or more. Coated steel lasts a similar span with occasional touch-ups, depending on soil moisture and coating quality.
