You can purchase plastic edging from most gardening centers and home improvement stores. [2] X Expert Source Keith SouzaHome Improvement Specialist Expert Interview. 20 August 2021. Besides giving a neat look to the lawn, it acts as a barrier and prevents grass from growing in unwanted areas. [3] X Expert Source Keith SouzaHome Improvement Specialist Expert Interview. 20 August 2021. Plastic lawn edging is commonly sold in 20 ft (6. 1 m) lengths. [4] X Research source The height of plastic lawn edging varies across brands. It typically ranges from 3–6 in (7. 6–15. 2 cm) high. Generally, 3 in (7. 6 cm) edging is inexpensive and widely available, yet short enough for the grass rhizomes to easily grow into the garden bed, while 6 in (15 cm) is more expensive and difficult to find, yet will make garden bed maintenance easier in the long run. [5] X Research source

The width of the trench must be slightly larger than the width of the edging. Although it depends on the width of your particular edging, approximately 2 in (5. 1 cm) is normally sufficient. [8] X Research source You can use a rototiller rather than a shovel if you prefer. [9] X Research source Make sure you dig the trench deep enough so the plastic edging doesn’t stick up out of the ground. If the edging sticks up too much, you could hit it with your lawn mower and cause damage. [10] X Expert Source Jeremy YamaguchiLawn Care Specialist Expert Interview. 21 January 2020.

Once you have cut away the small roots, remove them from around the trench so that you have a clear space to work.

Avoid placing edging around garden beds where there are many large tree roots, as you don’t want to cut away at the edging too much.

With an 8 in (20 cm) long connecter, 4 in (10 cm) from each end of edging will be used. The plastic lawn edging kit will come with connector pieces that you can use to connect 1 roll to another.

Make sure that the soil is tightly packed. The edging will be the right height so that a lawnmower won’t get caught on it.

Stakes for plastic lawn edging are either straight or perpendicular in shape. These are installed in the same way.

You don’t need to saturate or flood the soil, as just enough water to make it moderately damp will do.