Posted: 04/10/2014 at 23:14
Firstly if you do what you have described, it won't last 5 minutes. If it's going to retain soil it needs a proper foundation and cement, especially if there is any weight behind the wall, and wet soil is heavy.
Have you thought of railway sleepers or scaffold planks instead. It really depends on what you want and the look you want to achieve and how long you want it to last.
Sleepers and bricks will last longer, sleepers don't lead to drainage problems, brick walls properly constructed with drainage slits have few problems as well.
I've done small beds with dry laid bricks, but they end up draining too quickly and are quite high maintenance.
How wide/long is the wall going to be? Dry laid bricks move too easily especially if you have children or animals.
I'd put a foundation of sharp sand and cement mixed 3 to 1 as a foundation, then lay bricks with cement to the required height. You shouldn't get huge drainage problems at that sort of height, and you can leave a slit between the 3rd and 4th brick on the first layer if your'e worried about it, and you can incorporate a step/s to give easy access to the lower level. It will last as well.