If the difference is big for instance, you will need to plant something that is midway between the two. And a group of trees can block an undesirable view. Density Solid boundaries aren't always necessary, but in some areas they are needed. For a residential property, a low or partially open structure will usually do. A deciduous hedge can weaken strong winds, whereas a solid evergreen one would obstruct them completely.
Divisions Protecting a garden from a recreational area is often necessary.
A hedge or a wall can do the job, but a trellis or a pergola creates a softer image and will allow more light into your yard. People who have a bigger yard can create themed sections. Walls Walls can be dressed-up nicely with vines or shrubs. Blocking a damaged part of a wall is a good idea. If your brick or stone wall is pretty, let it show, don't camouflage it.