Many gardeners use stone and rock edgings in landscaping for their durability and aesthetic appeal, but plastic landscape edging has its uses in a yard also. When your main purpose is to separate a planting area from grass and keep the grass from spreading, plastic landscape edging is a suitable choice. With its unobtrusive height, plastic edging will effectively separate your planting areas.
Dig along the edge of the planting area with the shovel. Make a trench with vertical sides and dig down approximately 4 inches along the entire perimeter of the planting area.
Position the plastic edging along the side of the trench around the planting area, with the top of the edging extending above the soil level approximately 1/2 inch and the lip of the edging facing in toward the planting area.
Trim the edging off with the pruning shears at the length required to line the entire planting area. If you must join two edging pieces, insert a coupler into the upper channel of each edging piece and use it to join the two sections.
Drive stakes every 4 feet through the plastic edging into the solid turf on the outside of the planting area. Angle the stakes and pound them into the compacted soil to hold the plastic edging in place.
Shovel topsoil into the trench to fill it, spreading the topsoil up against the plastic edging.
Moisten the topsoil slightly with the garden hose and tamp it down by walking along the perimeter of the planting area next to the plastic edging. Continue adding topsoil as necessary until the topsoil comes to the upper lip of the plastic edging.
Rake the topsoil smooth to finish installing the plastic edging.