Posted: 18/11/2014 at 00:24
A bed 16 ft long is fine. Anything over 4 ft wide is difficult because you will be tempted to walk on the soil, and that is not good, as the whole point of a raised bed is that you work it from the sides. Most people can reach 2 ft easily but not much more.
If you want to work the bed while balancing on 2x4 that is entirely up to you. At my age it's not an option!