Cutting New Borders

Run a mason's line between end stakes along each edge of the bed. Set the lines at ground level, then sprinkle powdered chalk over them to mark the bed edges.

Cut along each marked edge with a spade or garden edger. Push the blade of the tool 4 to 6 inches into the ground to sever unwanted roots close to the surface.

Cut clean edges for the bed by taking out a strip of sod 3 to 4 inches wide. Eyeball the distance and dig toward the first cut at a 45-degree angle to dislodge roots.