Blocks for Landscape Edging: A Step-by-Step Guide to Clean Borders

By Caleb Morgan

Updated November 2026

Blocks for landscape edging give you a crisp, permanent line between your lawn and your beds, and they can be installed with basic tools over a weekend. This guide walks through choosing the right block type, preparing the trench and base, setting and leveling the units, and finishing the border so it stays put through freeze-thaw cycles and mower passes. By the end, you will know how much material to buy, how deep to dig, and where most DIY installs go wrong.

Choosing the Right Type of Block

Not every block works the same way along a border. The best choice depends on how much edge you need, whether the border will carry foot traffic or mower wheels, and how much curve you need to work with.

Shopping for one? See our guide: 6 Best Easyflex No Dig Landscape Edging Kit Options for Clean Lines (2026).

• Concrete interlocking blocks are the most common. They are heavy, stable, and available in straight, paver-style, and retaining profiles. They suit most residential beds.
• Clay or brick-style units give a traditional look, but they can chip under mower wheels if set too high.
• Resin or recycled plastic blocks are lighter and easier to cut, though they may flex more on soft soil.
• Natural stone blocks offer the most character but vary in thickness, which makes leveling slower.

For a straight run that mowers will pass over, a flat-top concrete block with a height of 4 to 6 inches above grade is a sensible default. For a curved bed, choose a smaller unit that can be cut or set in tight arcs without leaving large gaps. If you are still comparing overall options, see What Are the Best Options for Landscape Edging? 7 Choices Compared for a side-by-side look at materials.

Tools and Materials You Will Need

Gather everything before you dig. Stopping halfway to find a level or a bag of base material wastes time and lets the trench collect rain.

• Flat spade or edging spade for cutting the trench line
• Stakes and mason’s line for marking a straight run
• Garden hose or marking paint for curves
• Plate compactor or hand tamper
• 4-foot level and a rubber mallet
• Crushed stone base (3/4-inch minus gravel works well)
• Coarse sand for a leveling bed, roughly 1 inch deep
• Masonry saw or angle grinder with diamond blade for cutting units
• Landscape fabric, if the bed sits on heavy clay or sod-heavy soil
• Exterior-grade construction adhesive, if you want the blocks locked in place

Measure your total run and add about 10 percent for cuts and waste. Count the number of units needed by dividing the run length by the length of one block, then add the corner pieces you need.

Step-by-Step Installation

Step 1: Mark the Line

Drive stakes at each end of the run and stretch mason’s line between them, keeping it about 2 inches off the ground. For curves, lay a garden hose in the shape you want and spray the outline with marking paint. Check that the line is clear of underground utilities before digging; call 811 in the US to request a locate.

Step 2: Dig the Trench

Dig a trench slightly wider than the block and deep enough to hold the block plus a base layer. A common target is a total depth of about 6 to 8 inches for a block that sits 2 inches below grade, with 3 to 4 inches of compacted base beneath it. Keep the trench walls vertical and the bottom flat so the units bed evenly.

Step 3: Build and Compact the Base

Spread crushed stone in 2-inch lifts and compact each lift with a plate compactor or hand tamper. Aim for a base depth of at least 3 inches after compaction. Skipping this step is the single biggest reason blocks heave or sink after the first winter.

Step 4: Add the Leveling Bed

Spread about 1 inch of coarse sand over the compacted base and screed it smooth with a board. Do not compact the sand heavily; it should stay loose enough to adjust under each unit.

Step 5: Set the Blocks

Start at a fixed point, such as a corner or the end of a straight run. Set each block so its top edge sits at the target height and its face follows your line. Check each unit with the level in both directions. Tap down with a rubber mallet, never with metal.

Leave a hair of space, about 1/8 inch, between units if the manufacturer’s joint system calls for it. If your blocks interlock, the joint will close on its own as you set each piece.

Step 6: Cut and Fit the Ends

Mark cuts on the block face and cut with a masonry saw, wearing eye and ear protection and a dust mask. Work slowly and keep the blade cool. A cut end at the finish of a run should sit tight against the last full unit.

Step 7: Backfill and Check Alignment

Backfill behind the blocks with soil or gravel and tamp lightly. Sight down the line from each end to catch any wobble. Re-check level after the backfill, since packing soil can shift a block slightly.

Curves, Corners, and Tight Radii

Curves are where many installs look amateur. For gentle arcs, keep units straight and let the joints open slightly on the outside of the curve. For tighter radii, use narrower blocks or cut wedge-shaped pieces so the face stays smooth. A paver-style unit with a small notch often bends better than a large straight block.

Common Mistakes to Avoid

• Skipping or under-compacting the base, which leads to heaving and sinking
• Setting blocks on bare soil without any gravel layer
• Setting the top too low, so mulch and soil wash over the edge
• Setting the top too high, which makes mowing and trimming awkward
• Failing to check level in both directions on every unit
• Using a metal hammer, which chips concrete and cracks plastic
• Forgetting to call 811 before digging

Tips for Longer-Lasting Results

Check the border each spring for heave caused by frost. Reseat any units that have moved and top up the base as needed. If you plan to plant right against the edge, lay landscape fabric first to slow weed growth in the joints. For a broader look at how edging fits into a full bed plan, the walkthrough at Landscape Edging and Borders: 6 Steps to Clean, Lasting Lines covers layout and spacing in more depth.

If you prefer a different material or a more budget-friendly approach, related guides such as Landscape Rocks for Edging: A Step-by-Step Guide to Clean Borders and Low Cost Landscape Edging: 6 Best Budget Picks for Clean Lines compare alternatives that use similar installation steps.

Recommended Gear

• Plate compactor: Compacting the base in thin lifts is what keeps blocks from settling. A plate compactor is worth renting or buying for any run longer than a few feet. View on Amazon
• Diamond blade masonry saw: Clean cuts on concrete units reduce chipping and keep joints tight at the ends. View on Amazon
• 4-foot level: Checking level along the full length of each block is faster and more accurate than eyeballing. View on Amazon
• Exterior construction adhesive: Useful for locking units in place on slopes or where blocks will face heavy foot traffic. View on Amazon

FAQ

How deep should I dig for blocks for landscape edging?

Most block installs call for a total trench depth of 6 to 8 inches, including about 3 to 4 inches of compacted gravel base and 1 inch of sand. Check the manufacturer’s specification, since some profiles need more depth.

Do I need a concrete base under edging blocks?

For typical residential borders, a compacted crushed stone base is enough. A concrete footing is generally reserved for retaining walls or very heavy-use edges.

Can I install blocks for landscape edging without a plate compactor?

Yes, a hand tamper works for short runs. Compact the base in thin layers and check for firmness by stepping on it. For longer runs, a plate compactor saves considerable time.

How high should the top of the block sit above the lawn?

A common target is 1 to 2 inches above the lawn surface on the lawn side, so the mower can run cleanly along the edge without damaging the block. The bed side may be set slightly lower to hold mulch.

Why do my blocks keep shifting after rain?

The most likely causes are a thin or uncompacted base, soil washing out from behind the blocks, or a lack of drainage. Re-excavate the affected section, rebuild the base, and make sure water can drain away from the border.

Can I cut concrete edging blocks at home?

Yes, with a masonry saw or angle grinder fitted with a diamond blade. Wear eye, ear, and respiratory protection and cut outdoors. Consult a professional if you are unsure about power tool use.

How long do blocks for landscape edging last?

Concrete and quality resin blocks often last many years when properly installed, though the exact lifespan depends on climate, soil, and maintenance. Owners often report that most problems trace back to the base rather than the block itself.

Is professional installation worth it for a long run?

For long, curved, or sloped runs, a professional installer can save time and reduce the risk of settling. Get quotes from local landscapers and confirm they include base preparation in the scope of work.

Conclusion

Blocks for landscape edging deliver clean, lasting lines when the base is built properly and each unit is set level at the right height. Choose a block type that suits your traffic and curve needs, dig a trench deep enough for a compacted gravel base, and check every unit as you go. Avoid the common mistakes above and your border should hold its shape for years.

Related reading

• Concrete Block Landscape Edging: A Step-by-Step Guide (2026)
• Wood Landscape Timber Edging: A Step-by-Step Install Guide

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.