You can start from the obvious reason that a hedge is more attractive than a boring fence, but there are many other reasons as are explained here. For instance a hedge can create rhythm, a nook, soften the screen and even provide food with an edible hedge.? There are another eight great ideas in this article by Patricia Tyrrell which I found on the Houzz website.

A hedge can be a wonderfully functional and ornamental addition to a garden. Whether you want a tall, dense plant for privacy, or a sculptural clipped box to add character, check out these inspiring ideas to help you choose the right hedge for your outdoor space.

Thorp Design

Get some rhythm
A hedge doesn?t have to be a plain rectangle. The nature of hedging, with its fine texture and tolerance of clipping and shaping, allows for all manner of patterns and geometries: regular triangles, squares or circles, or softer curves and waves. So there are lots of opportunities to get creative. Here, the rhythm of a low zig-zag pattern creates extra movement and interest on a walkway. The shadows it casts on the ground add to the overall effect, too.

Ian Barker Gardens

Create a nook
We all feel more relaxed with the protection of a solid surface at our backs, whether it?s in a restaurant or in the garden, and a hedge can serve just this purpose. There is something so inviting about a cosy, sheltered nook, slightly recessed into the hedge, allowing us to view the garden, and the world, from our own small refuge.