You have a wide variety of smart garden wall decoration ideas to choose from. In case you don't have great ideas then you can explore them below.
Planters can be used to adore the beauty of this wall. You can paint the planters and then hang them on the wall. For example, 9 planters set in three columns definitely boost up the beauty of your space. It is good to pick small and cute planters. A very big size won't look super cute.
Another idea to try is set a fake waterfall against the wall of a garden. This might cost you a little money but charm of your garden will be increased to a great extent.
Vibrant color tiles can be used to increase the beauty of a wall. Mosaic tiles are commonly used. But you have other kinds of tile options to choose from. Granite tiles are durable but you can try laminated wall options as well.
Don't miss some more smart garden wall decoration ideas.