When I first pulled all the overgrown bushes out of my front garden beds, I needed to install a border to keep the mulch from washing onto the sidewalk. I went to the garden center and bought two fifty-foot coils of cheap black plastic edging. It was incredibly inexpensive and I thought it would take an hour to install.
First of all, rolled plastic has a memory. It desperately wants to stay in a circle. I had to lay it out in the hot sun on my driveway and put heavy bricks on the ends just to get it to lie flat.
I dug the trench, buried the plastic, and hammered in the cheap plastic stakes. It looked fine for the first summer. Then winter hit. The ground froze, expanded, and literally squeezed the plastic edging straight up out of the dirt. By spring, the edging was sitting two inches above the soil line, weaving back and forth like a roller coaster. When I tried to trim the grass next to it, my weed whacker immediately shattered the brittle, cold plastic into sharp little pieces.
I ended up pulling all one hundred feet of it out with a pair of pliers. I spent the extra money on heavy-gauge steel landscape edging instead. It comes in straight pieces, it never bends out of shape, and the frost cannot push it out of the ground. Do not waste your weekend burying cheap plastic. It will not survive the winter.