A raised garden bed is one that is built off the ground, usually in some form of boxed structure. It requires no digging – the worms do that for you – which improves the structure of the soil and increases its nutrient value.
As a raised bed is self-contained the growing bed can be adapted for any plant requirement, alkaline, acid or neutral, depending on what you want to plant.
The bed should be narrow enough to reach across it without bending your back too much from either side, the best width is about 1.2 metres. This allows for easy access with no bending double, kneeling or squatting.