Plastic garden edging is one of the least expensive mediums for defining a flower or vegetable bed. It generally takes less time and effort to install plastic landscape edging, when compared to other edging materials. Plastic edging will assist in keeping grass from growing into beds and can help keep gravel or other mulch in place. Due to its low profile, it is not recommended for use to create raised gardening beds of any type, according to Texas A&M University Extension.
Mark the outline of where the garden edging is to be installed. Pound wooden stakes into the ground to mark the corners and run string from stake to stake to establish where the plastic edging will be laid.
Measure the height of the plastic edging with a tape measure.
Dig a trench with a shovel, following the outline of the string and stakes. The trench's depth should be a 1/2 inch less than the total height of the plastic edging.
Insert the plastic edging into the trench. Check for level at several different points. Remove soil at any high points and fill in low points with soil.
Trim the plastic edging, with scissors, to fit snugly into the trench.
Insert the coupler into the top channel of one end of the edging. Leave half the length of the coupler protruding from the channel.
Join the two ends of the edging. Slide the protruding end of the coupler into the channel of the other edging's end.
Secure the edging in place. Drive anchor stakes, every 3 to 4 feet, through the outside-bottom area of the edging and into the ground.
Backfill the trench. Replace the soil, placing it on the inner side of the edging, to secure the edging up against the outside of the trench.
Compress the soil by stepping on it. Water the soil well, with a garden hose, to further secure the plastic edging in place.