Caleb MorganBy Caleb Morgan

Updated November 2026

Using landscape timbers for edging gives you a firm, straight border that holds back mulch, grass and soil with a clean, structured look. This guide walks through choosing the right timbers, marking the layout, setting them level and securing them so the edge stays put for years. Most DIY installs take a weekend for a modest bed.

Choose the Right Timbers and Layout

Landscape timbers are typically sold in standard cross-sections, and the most common choice for edging is a 6-inch by 6-inch or 4-inch by 6-inch piece. Pressure-treated pine is the usual budget pick, while rot-resistant species such as cedar or black locust last longer in wet soil. Manufacturers generally rate pressure-treated lumber for ground contact, so confirm that label before buying. Plan the bed shape first, and keep curves gentle: timber bends poorly, so tight radii need cuts or a different material.

Shopping for one? See our guide: 7 Best Landscape Timber Driveway Edging Options for Clean Lines (2026).

Mark the Line and Dig the Trench

Lay a garden hose or spray paint along the planned route and step back to check the flow. Once you are happy with it, cut through the sod with a spade along both sides of the line. Dig a trench about 2 inches deeper than the timber’s height so the top sits slightly above grade. Keep the trench bottom flat, and remove grass roots and rocks so each timber rests evenly.

Set, Stack and Secure the Timbers

Work in steps to keep the line true:

  1. Set the first timber in the trench and check it with a level in both directions.
  2. Add a 1-inch layer of crushed stone or sand under any low spots so the timber sits flat.
  3. Stack the next timber and offset the ends so joints do not line up in a straight seam.
  4. Drill pilot holes through each joint, then drive 12-inch or longer rebar stakes or galvanized spikes through the timbers and into the soil below.
  5. Check level and alignment after every two or three courses, and adjust before moving on.

Stakes are what keep stacked timbers from creeping outward, so do not skip them on any run longer than a few feet.

Backfill and Finish the Edge

Once the timbers are secured, backfill the inside of the bed with soil or mulch to lock everything in place. Tamp the backfill gently to remove air pockets without compacting the root zone. Trim any grass that grows right against the outside face using a string trimmer, which keeps the edge crisp. A stiff edger works well for cleaning the line at the base of the timber each season.

  • Spade with a straight edge: makes clean trench cuts through sod and keeps the sides vertical. View on Amazon
  • Line level and torpedo level: checks each timber in both directions so courses stay even. View on Amazon
  • Rebar stakes: anchor stacked timbers to the soil and prevent outward drift. View on Amazon

Common mistakes

  • Skipping the gravel or sand base, which lets low spots sink and tilt the timbers over time.
  • Lining up joints in a single seam, which weakens the stack and makes it look uneven.
  • Using untreated lumber in ground contact, which rots quickly.
  • Setting timbers too high, so the edge catches the mower deck and gets chewed up.
  • Forcing tight curves with straight timbers, which leads to gaps and cracks at the bend.

FAQ

How deep should I bury landscape timbers for edging?

Bury the first course so about one-third to one-half of its height sits below grade. This gives the stakes something solid to grip and keeps the top high enough to act as a border.

Can I use landscape timbers on a curved bed?

You can, but use shorter pieces and make small, staggered cuts along the inside of each curve. Very tight curves are better served by flexible edging materials.

How long do landscape timbers last as edging?

Pressure-treated pine often lasts many years in the ground when properly installed, while rot-resistant woods can last longer. Lifespan depends heavily on soil moisture and drainage, so check your edging every season for soft spots.

Conclusion

Using landscape timbers for edging comes down to four things: a clear layout, a level trench with a gravel base, staggered joints and solid stakes. Follow those steps and your bed edge will stay crisp for seasons. Keep the outside line trimmed and the timbers will look sharp all year.

Ready to choose one?

Caleb Morgan

About Caleb Morgan

Caleb Morgan is part of our editorial team and reviews and edits our lawn edging & trimming guides, checking product details against manufacturer specifications and owner feedback.