It is a good idea to have some form of edging around your lawn and garden to keep the landscape looking neat and tidy. Of course, there will be some form of overgrowth. This is inevitable, but by placing a clear barrier around the edges of the landscape you prevent grass, weeds and plants from sending out underground roots beyond your landscape's edging. There are many ways to edge your landscape, some better suited to your lawn and pocketbook than others.
Ceramics are generally the most expensive, but they last the longest. Use interlocking pavers' bricks to create a colorful design without need for adhesives. Use fieldstone pieces to create a thin rim or an entire walkway around the edges of your landscape. This is a style commonly used in old Appalachian homes and English gardens. The drawback is that weeds and grass can sprout up between the stones unless they are mortared in place. Rub a little bat guano into the mortar once it's dry and place fern moss over it. The moss will take root in about a week, making the stone look old and dignified.
Metal sheeting is a material lots of professional landscapers use. It's thin enough to bend around curving edges and highlights solitary trees and bushes for display. Copper creates a modern look because it will develop a blue-green patina over time. Place it in strips and solder the overlapping edges together or use a series of punches and a hammer to make designs before you install it.
Plastic is an inexpensive material you can use for landscape edging, and easy to work with too. It comes in matte black rolls about 6 inches in height. Just dig a thin trench surrounding your landscape and place it. Because it's so malleable, it works well for edging that curves. If you don't like the look, bury the edging entirely. It will still do its job of keeping grass and plant roots from crossing the barrier and creates a simple, minimalist appearance.
You can use wood to edge the landscape in many different ways. Use 2-inch cedar shingles hammered into the turf to create a vertical row for edging grass and garden beds. In that same vein, use inexpensive dowel poles. Simply cut them into 6- to 8-inch lengths, paint them to complement your landscape, and them sink them along the edges of your landscape. For a countrified appearance, dig a slight depression along your edging and then lay railroad ties in it so they're sunken, half buried.