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Wood landscape timber edging gives you a clean, defined border between your lawn and beds, and it can be installed in a weekend with basic tools. This guide walks you through choosing the right timber, planning the layout, setting and anchoring the pieces, and protecting the wood so it lasts. By the end, you will have a straight or gently curved border that holds mulch and turf in place.
What Wood Landscape Timber Edging Is Best For
Landscape timbers are heavy, rectangular lumber pieces, usually sold in lengths of 8 feet and cross-sections around 4 by 6 inches or 6 by 6 inches. They work well for raised garden beds, terraced slopes, mulch borders and defining the edge of a lawn where it meets planting areas. Timber has a softer, more natural look than metal or plastic, and it blends with wood decks, fences and rustic landscapes.
Shopping for one? See our guide: 10 Best Edging Tools for Yard Options for Clean Lawn Lines (2026).
Timber is less suited to tight curves, since the pieces are stiff and tend to crack if bent hard. It also needs more maintenance than stone or metal because wood breaks down in contact with soil and moisture. If you want a crisp, low border with a minimal profile, thinner wood or another material may fit better. For a broader comparison of wood options, see Best Landscape Borders for a Natural Look: 5 Wood Edging Compared.
Choosing the Right Timber
The wood species and treatment matter more than almost any other decision. Rot-resistant species such as black locust, cedar and redwood last longer in ground contact than untreated pine. Pressure-treated lumber rated for ground contact is the most common choice for landscape timbers because it lasts for many years, though you should confirm the label says it is rated for ground contact rather than above-ground use only.
Look for these features when buying:
- A ground-contact rating on the tag, or a clear species name for naturally durable wood.
- Straight pieces without deep checks, large knots or warping, since twisted timbers are hard to level.
- Consistent dimensions across all pieces so the top edge stays even.
- Dry or kiln-dried lumber where possible, which tends to stay straighter after installation.
Avoid using railroad ties for food gardens or play areas. Older ties were treated with creosote, which can leach into soil, and many local rules restrict their use.
Planning the Layout
Before you dig, mark the path of the border. Use a garden hose for curves, since it is easy to reshape until the line looks right. Spray paint or landscape flags work well for marking straight runs. Step back from the border often and check it from several angles, because small wobbles are much more obvious from a distance.
Measure the total length you need and add about 10 percent for cuts and waste. Decide how many courses (stacked layers) you want. Two courses are typical for mulch borders, while retaining slopes may need three or more. For planning shape, width and plant placement, see Landscape Borders: Planning Shape, Width and Plants.
Tools and Materials You Will Need
- Landscape timbers, sized and rated for your use
- Rebar pieces, about 24 inches long, or galvanized landscape spikes
- Spade or flat shovel and a mattock for rocky soil
- Level (4-foot is ideal) and a string line
- Circular saw or handsaw for cuts
- Drill with a long bit or a rebar driver
- Gravel or crushed stone for the base (optional but recommended)
- Landscape fabric (optional, for weed control behind the border)
- Exterior-rated wood preservative or sealer
- Safety glasses and gloves
For a fuller list of tools that handle digging and edge cutting, see Tools for Installing Lawn Edging: A Practical Kit.
Step-by-Step Installation
Step 1: Dig the Trench
Dig a trench slightly wider than the timber and deep enough to set the first course about 1 inch below the finished grade. The first course is the foundation of the whole border, so take time to get the trench bottom flat and firm. Remove sod, roots and rocks, and tamp the soil with the back of a shovel.
Step 2: Add a Gravel Base
Spread 2 to 3 inches of compacted gravel in the bottom of the trench. The base drains water away from the wood, which reduces rot, and it gives you a stable surface for leveling. Compact the gravel in layers, tamping each one before adding the next.
Step 3: Set the First Course
Lay the first timber in the trench and check it with a level in both directions. Shim low spots with a little gravel or sand. Work along the line, keeping the top edge at a consistent height. Use the string line to keep runs straight or to guide gentle curves.
Step 4: Cut and Fit Corners
For outside corners, overlap the timbers and cut a notch so the pieces interlock. For inside corners, butt the ends together and secure them well. Cut ends with a circular saw, then brush or treat the fresh cut with preservative, since exposed end grain absorbs water quickly.
Step 5: Anchor the Timbers
Drill pilot holes through each timber at 2 to 3 foot intervals, or at each joint, and drive rebar or spikes into the ground. Leave the top of the rebar slightly below the timber surface so it does not stick out. Drive a second course over the first, offsetting joints by at least 12 inches, and secure it the same way.
Anchor pins should go at least 12 to 18 inches into the soil. Shorter pins can pull out over time, especially on slopes or where the ground freezes and thaws.
Step 6: Backfill and Finish
Backfill behind the border with soil or mulch and tamp lightly. If you used landscape fabric, lay it along the inside edge before backfilling. Apply a preservative or sealer to all cut ends and the exposed faces, following the product label for drying time.
Timber Edging Factors at a Glance
| Factor | Recommendation | Why It Matters |
|---|---|---|
| Wood type | Ground-contact pressure-treated or naturally durable species | Resists rot and insects in soil |
| Base depth | 2 to 3 inches of compacted gravel | Improves drainage and stability |
| Anchor length | 12 to 18 inches | Prevents pins from pulling out |
| Anchor spacing | Every 2 to 3 feet, plus at joints | Holds courses together against soil pressure |
| Joint offset | At least 12 inches between courses | Strengthens the wall |
Common Mistakes and Tips
- Skipping the gravel base. Timber sitting directly on soil stays wet and rots faster and tends to settle unevenly.
- Using untreated lumber in the ground. Standard lumber can decay within a few years when in contact with soil.
- Leaving cut ends unsealed. End grain is the fastest route for moisture into the wood.
- Stacking joints in line. Offsetting joints makes the border far more rigid.
- Forcing bends. Timber cracks on tight curves. Use shorter pieces or switch to a flexible material for sharp turns.
- Setting the first course too high. Leave it slightly below grade so mulch and soil do not spill over the top.
- Ignoring slope. On a grade, stack courses with extra anchors and consider a sloped base to keep the line level.
Recommended gear
A quality rebar driver or long drill bit makes anchoring far easier and reduces the chance of splitting timbers. A four-foot level keeps the top course consistent across longer runs. A penetrating wood preservative applied to cut ends extends the life of every piece you install.
- Rebar driver or long spade bit: Speeds up drilling pilot holes and driving anchors through thick timbers. View on Amazon
- Four-foot level: Lets you check several timbers at once for a consistent top line. View on Amazon
- Exterior wood preservative: Protects cut ends and exposed faces from moisture and rot. View on Amazon
FAQ
How deep should I bury wood landscape timber edging?
Bury the first course about 1 inch below the finished grade, with the top of the timber slightly above the soil on the bed side. Deeper burial is common for retaining walls, but for simple borders a shallow setting is enough.
How long does landscape timber edging last?
Pressure-treated timber rated for ground contact commonly lasts many years in typical garden conditions. Naturally durable species can also last a long time. Lifespan depends on moisture, soil type and how well cut ends are sealed.
Can I use landscape timbers for a curved border?
Gentle curves are possible, especially if you use shorter pieces that follow the arc. Tight curves tend to crack the timber. For sharp bends, consider a flexible material that handles curves better.
Do I need landscape fabric behind timber edging?
Fabric is optional. It helps reduce weeds growing through the soil at the border line, but it can also trap moisture. Many installers place it only on the bed side, and some skip it entirely in favor of a gravel base.
What is the best way to attach timbers together?
Stacked courses are usually secured with rebar or landscape spikes driven through pilot holes. Some people add long structural screws at corners. Whatever method you choose, offset joints and anchor each course firmly.
Is pressure-treated wood safe for vegetable gardens?
Modern pressure-treated lumber uses copper-based preservatives that are considered suitable for ground contact, and many gardeners use it for raised beds. If you have concerns about chemicals near edible plants, consider naturally durable species or a different material, and consult your local extension office for guidance.
How do I stop timber edging from moving on a slope?
Use more anchors per timber, drive them deeper, and build the first course on a level gravel base. On steep grades, a retaining design with three or more courses and a compacted base works better than a single stacked line.
Conclusion
Wood landscape timber edging is one of the most flexible border options for a natural-looking yard. Choose ground-contact-rated lumber, build a firm gravel base, offset your joints and anchor every course well. Take the time to level and seal the wood, and your border should hold its line for years.
