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Landscape timbers for edging are one of the most common ways to define a garden bed, separate a lawn from a mulch area, or build a raised border with a rustic look. They are heavy, solid, and easy to stack, which makes them a practical choice for straight runs and gentle curves alike. The catch is that not every timber suits edging. Some rot within a few seasons when they touch soil, some warp, and some are too thin to hold a level line once they are set. This guide looks at seven popular timber types and sizes, using the criteria that matter most for edging: rot resistance, dimensional stability, weight and handling, length and cut options, and how well each one holds a clean edge against grass and mulch.
Our Top Picks
Quick Comparison
| Product | Best for | Key feature |
|---|---|---|
| Ground-contact pressure-treated pine landscape timbers | Budget-minded straight borders | Chemical treatment for soil contact |
| Cedar landscape timbers | Natural look and easy handling | Built-in resistance to decay |
| Redwood landscape timbers | Premium garden beds and raised edges | Dense, naturally durable heartwood |
| Black locust landscape timbers | Long-lasting in-ground edging | Very high natural rot resistance |
| Oak landscape timbers | Heavy-duty curved and stacked borders | Dense, strong, and substantial |
| Composite landscape timbers | Low-maintenance, rot-proof edging | Will not rot, splinter, or need staining |
| Hardwood railroad-style timbers | Bold, heavy retaining-style edges | Thick profile for a strong visual line |
Ground-Contact Pressure-Treated Pine Landscape Timbers
These are the most widely available option and a sensible default for straight garden borders where you want a classic look without paying for premium wood. They suit gardeners who plan to replace or refresh the edge every several years, or who keep the timber out of constant wet contact.
Key specs
- Typical nominal size: 6 x 6 inches or 4 x 6 inches
- Rated for ground contact in the label listing
- Common lengths: 8 feet and 10 feet
- Sold in natural green tint or stained finishes
Pros
- Widely stocked and easy to find in most regions
- Treatment gives reasonable decay protection in soil
- Takes paint or stain well if you want a color
Cons
- Can check and twist as it dries, so straight runs need care
- Owners often report lifespans measured in years rather than decades in wet soil
Cedar Landscape Timbers
Cedar is a good match for gardeners who want a warm, natural appearance and a timber that is easier to cut and move by hand. It works well for raised beds, curved edges, and borders that will sit in partial shade, where cedar’s natural oils slow decay.
Key specs
- Common nominal sizes: 4 x 4 inches, 4 x 6 inches, 6 x 6 inches
- Lighter than oak or redwood at the same dimensions
- Natural tannins give a silver-gray weather patina over time
Pros
- Naturally resistant to rot and insects without chemical treatment
- Lighter weight makes placement easier for one person
- Machines and cuts cleanly for corners and custom lengths
Cons
- Softer than hardwoods, so it dents more easily under heavy equipment
- Knots and checking are common in some grades
Redwood Landscape Timbers
Redwood suits buyers who want a refined, long-lasting border and are willing to spend more for heartwood with strong natural decay resistance. It is a good fit for visible front-yard edges and raised garden beds where appearance matters as much as performance.
Key specs
- Heartwood grades rated for longer outdoor service than sapwood
- Typical sizes: 4 x 4 inches and 4 x 6 inches
- Stable grain that resists warping in most conditions
Pros
- Heartwood has excellent natural rot resistance
- Rich color and a clean grain pattern
- Stays relatively stable when exposed to weather
Cons
- Availability varies, and clear heart grades can be hard to source
- Softer than many hardwoods, so edges can chip during install
Black Locust Landscape Timbers
Black locust is often recommended for in-ground edging and posts because of its very high natural rot resistance. Gardeners who want a long-term border that will stay in wet soil for many years, without chemical treatment, tend to look at this wood first. It is less common in big-box stores, so availability depends on your region.
Key specs
- Very dense hardwood with high natural durability
- Usually sold in round or rough-sawn profiles
- Typical lengths: 6 to 8 feet, cut to order in many yards
Pros
- Among the most rot-resistant domestic woods for ground contact
- Strong enough to hold a straight line with stakes
- No chemical treatment needed
Cons
- Heavy and harder to cut by hand
- Can be difficult to find in finished landscape sizes
Oak Landscape Timbers
Oak is a strong choice for heavy-duty borders, stacked edges, and curved runs that need to hold their shape under soil pressure. It suits gardeners who want a substantial, traditional look and are comfortable handling heavier pieces.
Key specs
- Dense hardwood with high bending and compression strength
- Common sizes: 4 x 6 inches and 6 x 6 inches
- Tannin content gives a darker tone that weathers gradually
Pros
- Very strong and resistant to crushing or bowing
- Holds sharp corners and fasteners well
- Good visual weight for formal beds
Cons
- Heavy, which makes installation a two-person job for longer pieces
- White oak is better for outdoor use than red oak, and species labeling varies
Composite Landscape Timbers
Composite timbers are made from wood fiber and plastic, and they are a low-maintenance option for gardeners who do not want to stain, seal, or replace wood every few years. They are a practical pick for wet or shady sites where natural timber would rot quickly.
Key specs
- Common size: 4 x 6 inches with a solid profile
- Lengths usually 8 feet, with cut-to-size options
- Manufacturers typically specify UV-stabilized color
Pros
- Will not rot, and resists insects
- No staining or sealing needed
- Consistent dimensions make straight runs easier
Cons
- Can look more uniform than natural timber
- Heavier than cedar and harder to cut with a handsaw
Hardwood Railroad-Style Timbers
Thick hardwood railroad-style timbers give a bold, heavy line that works well as a low retaining edge or a feature border. They are best for experienced DIY builders who plan the base and drainage carefully, because the mass of the timber puts real load on the installation.
Key specs
- Typical profile: 7 x 9 inches or similar heavy section
- Usually sold in 8 to 10 foot lengths
- Hardwood species vary by supplier, so confirm before buying
Pros
- Strong visual presence and long lifespan
- Can serve as edging and light retaining in one piece
- Thick section resists bowing under soil load
Cons
- Very heavy, requiring equipment or several people to place
- Overkill for simple flower bed edging
Buying Guide
Choosing the right timber for edging comes down to a few practical factors. Start with where the timber will sit and how it will be used, then compare species, dimensions and treatment against that situation. If you are unsure how the edge should look or how wide the bed should be, it helps to plan the layout first. Our guide to Landscape Borders: Planning Shape, Width and Plants covers that step in detail.
Selection Criteria
- Ground contact: Timber touching soil rots much faster than timber sitting above grade. Look for wood rated for ground contact, or choose a naturally durable species.
- Dimensional stability: Some timbers twist or check as they dry. Straight borders are easier to keep neat with stable stock.
- Weight and handling: A 6 x 6 hardwood timber can weigh far more than a cedar piece of the same size. Plan for how you will lift and set each piece.
- Appearance: Natural grain, color and weathering vary widely. Decide whether you want rustic, formal or low-contrast.
Important Features
- Rot resistance rating or natural durability of the species
- Cross-section size, which affects stability and height
- Straightness of the piece and presence of large knots or checks
- Whether the timber is rough-sawn or planed, which changes how it stacks and looks
Specs to Check
- Nominal size versus actual size: lumber dimensions are usually smaller once dried and planed
- Treatment label or species name on the tag
- Length options and whether the seller will cut to size
- Recommended use, such as above-ground or ground contact
Choosing by Need
- Straight, budget-conscious borders: Ground-contact pressure-treated pine is a common starting point.
- Natural look with easy handling: Cedar is light and forgiving to work with.
- Long life in wet soil without chemicals: Black locust or heartwood redwood are typical choices.
- Maximum strength for curves and stacking: Oak or heavy hardwood sections.
- Zero maintenance: Composite timber avoids rot and staining entirely.
Things to Watch Out For
- Timber that is not rated for ground contact will often decay where it meets soil.
- Pressure-treated wood sometimes needs to dry before painting or staining, so check the manufacturer’s guidance.
- Heavy timbers can cause injury if lifted improperly. Use proper lifting technique or a helper.
- Pieces that are not level or square will make the whole edge look uneven. Sort boards before installation.
FAQ
What are landscape timbers used for in edging?
Landscape timbers for edging are used to define garden beds, separate lawn from mulch, create raised borders, and hold soil in gentle slopes. They can be laid flat, stacked, or set on end depending on the height and look you want.
How long do landscape timbers last as edging?
Lifespan depends on species, treatment and how much of the timber sits in soil. Ground-contact treated pine often lasts several years, while naturally durable woods such as black locust or heartwood redwood can last considerably longer. Composite timber is generally not subject to rot. Check the manufacturer’s stated ratings for your situation.
Should I use pressure-treated or untreated timber?
For timber that will touch soil, choose wood specifically rated for ground contact. Untreated softwoods like pine decay quickly in wet soil. Naturally durable hardwoods or cedar can be a good untreated option, but they usually cost more and may be harder to source.
How do I install landscape timbers for straight edging?
Mark the line, dig a shallow trench so the top of the timber sits level with the lawn or slightly above it, and set each piece on a thin layer of gravel for drainage. Secure with rebar stakes driven through pre-drilled holes or along the inside face, checking level and alignment as you go.
Can landscape timbers be used for curved borders?
Yes, but stiffer timbers bend less. Cut shorter pieces to follow curves, or use flexible materials for tight radii. Cedar and composite pieces are often easier to shape in short sections than dense hardwoods.
Do landscape timbers attract termites or other pests?
Any untreated wood in contact with soil can attract wood-boring insects, including termites, especially near a home foundation. Keep timber a safe distance from structures and consider composite or treated timber for areas near buildings. For concerns about a specific property, consult a pest control professional.
Are landscape timbers better than stone or metal edging?
Timbers offer a warm, natural look and are easy to customize in length. Stone and metal can last longer and resist movement better. The right choice depends on your style, budget category and how much maintenance you want. Our comparison of Lawn Edging Materials Compared: Metal, Plastic, Stone covers the trade-offs in more depth.
Conclusion
Landscape timbers for edging can give a clean, natural border when you match the wood to the site. For straight borders on a budget, ground-contact pressure-treated pine is a common starting point. For a natural look that is easy to cut and place, cedar is a practical choice. Gardeners who want long life in wet soil without chemicals often look at redwood heartwood or black locust. Oak and heavy hardwood timbers suit curves and stacked edges that carry load, while composite timber is the low-maintenance option when rot and staining are the main concerns. Before buying, confirm ground-contact ratings, measure the actual dimensions, and plan your layout. For more on edging options, see Best Landscape Borders for a Natural Look: 5 Wood Edging Compared.
