How to Lay Landscape Edging Blocks | A Step-by-Step Border

To lay landscape edging blocks, mark the border line, dig a trench 3–4 inches deep, add a compacted base layer, set the first block level, then continue block-by-block while checking alignment and backfilling for stability.

For the full breakdown, see our best Garden Blocks For Edging guide.

A crisp border transforms a yard, but getting blocks to stay straight requires proper base prep. Skipping it leads to shifting, sinking blocks needing resetting every season. A reliable installation follows: mark the line, dig the trench, prepare the base, then set and lock each block. This sequence holds up through freeze-thaw cycles and mower traffic.

Plan Your Layout and Mark the Line

Decide the border path before breaking ground. For straight runs, drive stakes at each end and stretch a string line tightly. For curves, a garden hose laid on the ground is most forgiving—adjust by eye until natural, then trace with marking paint or chalk. Spray paint, surveyor’s chalk, or flour all work for marking on turf or bare soil. Work slowly: a wavy layout line guarantees a wavy finished edge.

Dig the Trench to the Right Depth

Dig a trench 1–2 inches wider than the widest block. Most manufacturers recommend burying at least 2 inches of block below grade, typically requiring a trench 3–4 inches deep after accounting for the base layer. The trench floor should be flat and uniform; use a builder’s level or straight 2×4 to spot high spots. Remove all grass, roots, and loose soil so backfill binds against solid earth.

Prepare and Compact a Solid Base

A compacted base layer separates a season-long installation from one fixed every spring. Spread 1–2 inches of paver base, crushed gravel, or coarse sand in the trench bottom, then tamp firmly with a hand tamper or sledgehammer flat end. Walk the length twice—the base should feel solid with no footprints. This step is non-negotiable on clay-heavy soils and provides a uniform surface preventing blocks from tilting.

Set the First Block and Continue the Run

Place the first block at one end, preferably at the most visible part (corner nearest patio or walkway) where height errors show most. Set it on the compacted base, check level in both directions with a carpenter’s level, then tap with a rubber mallet until centered. This first block is your master guide; every subsequent block aligns to it. Continue laying end-to-end, checking level and alignment every 3–4 blocks. When ending against a walkway or curb, cut a block to fit—mark the line, score with a masonry chisel, and strike sharply to snap.

Backfill and Compact for Long-Term Stability

Once all blocks are set and level, backfill both front and back sides with loose soil, sand, or gravel. Tamp firmly with the mallet handle or hand tamper, packing tight against each block. Water the backfill lightly to settle material, then re-tamp any voids. The backfill should barely cover the buried block portion—about even with surrounding ground. Backfilling only one side causes leaning over time, especially on curved sections. If blocks sit slightly above grade (an inch or less), the edge holds mulch in place and keeps grass roots from creeping in.

Common Mistakes That Shorten an Edging Project’s Life

Three errors account for most failed borders. First, skipping the layout line produces a wavy edge. Second, setting blocks without a compacted base—especially on soft, sandy, or clay-rich soil—guarantees tilted blocks within one season. Third, failing to backfill and compact on both sides leaves edging loose and prone to shifting. Each adds fifteen minutes during installation and saves hours of resetting later.