Owen HayesBy Owen Hayes

DIY landscape timber edging lets you define a bed, keep mulch in place, and give your lawn a crisp border without hiring out the work. In this guide you will plan the layout, dig a level trench, set and anchor the timbers, and finish with backfill that keeps the line looking sharp for years. Most homeowners can complete a straight run of 20 to 30 feet in a single weekend with basic hand tools.

What You Need Before You Start

Timber edging is forgiving once it is in the ground, but the layout and digging stages decide how straight it stays. Gather your materials and tools first so you are not stopping mid-trench to make a run to the store.

Shopping for one? See our guide: Landscape Timbers for Edging: 7 Best Picks Compared (2026).

Materials checklist

  • Rot-resistant landscape timbers, typically 6 x 6 inches or 4 x 6 inches, cut to your run lengths
  • Rebar pieces, roughly 18 to 24 inches long, for anchoring (one or two per timber)
  • Landscape fabric, if you want weed suppression along the bed side
  • Coarse sand or crushed stone for a thin leveling base (about 1 to 2 inches)
  • Stakes or marking paint for layout
  • Stiff nylon string and a line level

Tools checklist

  • Flat spade or sharp-edged shovel
  • Mattock or pickaxe for roots and compacted soil
  • Four-foot level and a rubber mallet
  • Tape measure, hand tamper, and a drill with a long bit or a rebar driver
  • Circular saw or handsaw for cutting timbers, plus safety glasses and gloves

Step 1: Plan the Layout and Mark the Line

Start by deciding where the edge will sit. Walk the area and look at how the bed curves. Gentle arcs are easier to hold level than tight turns, and you should avoid sharp corners where a timber would need an awkward notch to fit.

Mark the outside edge of the timber with marking paint or stakes spaced every 4 to 6 feet. Then run string between the stakes, pulled taut, and check it with a line level so the string is roughly parallel to the finished grade you want. Measure out from the string on both ends to confirm the bed width is even.

Measure your timbers and plan joints

Measure the total run and divide it by your timber length to see how many pieces you need. Plan joints at a corner or at a point where the bed changes direction, not in the middle of a straight run. Cut ends square with a circular saw so they butt cleanly, and label which piece goes where.

Step 2: Dig the Trench to the Correct Depth

Dig along the string line to a width slightly larger than the timber, usually 8 to 10 inches for a 6-inch-wide timber. The depth should equal the timber height, with an additional 1 to 2 inches for the leveling base. For a 6-inch timber, that means a trench about 7 to 8 inches deep.

Cut the trench walls as straight as you can, and keep the bottom flat rather than sloped toward the lawn. Remove roots with the mattock and keep the soil you dig out in a separate pile so you can use it later for backfill.

Create a stable base

Spread 1 to 2 inches of coarse sand or crushed stone along the trench bottom and compact it with a hand tamper. A firm base keeps the timbers from settling unevenly, which is the most common cause of wavy edging a few months after installation.

Step 3: Set the First Timbers Level

Place the first timber in the trench and check it with a four-foot level both lengthwise and across the top. Tap it with the rubber mallet until it is level and sits at the height you want above the lawn grade. Many installers set the top about 1 inch above the surrounding turf so the lawn mower can pass without scalping.

Check the alignment against the string as you go. If the timber bows out, adjust it by digging or adding base material under the low spot rather than forcing it sideways.

Step 4: Anchor the Timbers with Rebar

Anchoring is what keeps timber edging from creeping over time, especially on slopes or in soft soil. Drill or drive a pilot hole through the timber at each end and near the middle of longer runs, then drive rebar through the hole and into the ground until the head sits just below the top surface.

Use one or two rebar pieces per timber, placed at the joints and roughly every 3 to 4 feet along straight sections. Drive the rebar slightly below the wood surface so it does not stick up where you will mow or step.

Stack and join timbers

If you need a double-height border, stack a second timber on top of the first and secure it with longer rebar or with galvanized spikes. For corners, overlap cut ends or use a half-lap joint so the corner stays square and the top surface remains flat.

Step 5: Backfill, Finish, and Protect

Backfill the outside of the timber with the soil you set aside, tamping it firmly against the wood so the edging does not wobble when you walk along it. Top with a thin layer of soil or mulch and rake the lawn side smooth so the transition looks intentional.

If you plan to use landscape fabric, lay it along the bed side before adding mulch, and tuck the edge under the timber. This keeps weeds from pushing up along the seam.

Common Mistakes to Avoid

  • Skipping the base. Timbers set directly on dirt sink unevenly within a season.
  • Setting the top too low. A timber flush with the lawn invites grass to grow over it and makes mowing messy.
  • Using untreated wood in soil contact. Choose rot-resistant or pressure-treated timber rated for ground contact, and check the label.
  • Anchoring too few points. One rebar per long run is rarely enough on slopes or in clay.
  • Rushing the layout. A few extra minutes with string saves hours of re-digging later.

Tips for a Cleaner Finish

  • Work in dry weather so the soil is easier to dig and the base compacts well.
  • Pre-drill holes in hardwood timbers to avoid splitting when you drive rebar.
  • Leave a small expansion gap at corners if you are mixing timber with other materials that move differently.
  • Stain or seal the exposed face if you want a uniform color, but check the product is safe for garden beds that grow edibles.

A few tools make the anchoring and cutting steps noticeably easier. A rebar driver lets you set stakes without bending them, and a good circular saw gives you square ends for clean joints. A four-foot level is essential for keeping the top edge even.

FAQ

How deep should I dig for landscape timber edging?

Dig deep enough for the full timber height plus a 1 to 2 inch leveling base. For a 6-inch timber, a trench around 7 to 8 inches deep is typical.

How long do DIY timber edges last?

Rot-resistant or pressure-treated timber often lasts many years in the ground, though service life depends on climate, soil moisture, and wood grade. Check the manufacturer’s rating for ground contact.

Do I need rebar to anchor timbers?

Rebar is strongly recommended, especially on slopes or in loose soil. It prevents shifting and keeps joints tight over time.

Can I install timber edging on a slope?

Yes, but step the timbers rather than running one long level line down the grade. Anchor each section with extra rebar and check that each step is level.

How far apart should I place rebar anchors?

Place one at each end and roughly every 3 to 4 feet along straight runs, adding extra at joints and corners.

Is timber edging safe near vegetable gardens?

Choose wood rated for ground contact and check the label for any restrictions near food crops. If you are unsure, consult your local extension office before planting edibles against treated wood.

Can I use a router or saw on timbers to make joints?

A circular saw or handsaw is enough for square butt joints and simple half-laps. Wear eye and hearing protection and follow the saw manufacturer’s safety instructions.

Conclusion

Good DIY landscape timber edging comes down to three things: a well-marked layout, a level trench with a compacted base, and firm anchoring with rebar. Take your time on the first run, check level as you go, and backfill firmly against the wood. With those steps done, your borders will hold their line through seasons of mowing and mulching.

Ready to choose one?

Owen Hayes

About Owen Hayes

Owen writes about lawn edging & trimming. Each guide starts with research into how products are built and what owners report after months of use, and is revised when better options appear.