Here is a great video on how to construct a raised bed garden using pallets.
This is like container gardening taken to the next level.
How to Build a Raised Bed Garden Using Pallets
Nathan gives full instructions on how to make these raised beds. This is great for people who have a lot of tree roots in their yard. Having a layer of air between your fertile garden soil and the ground helps to keep roots from going into your garden dirt.
This is also a way to get ultra rich and fertile soil for your plants, it makes very efficient use of space. All of the soil that goes into the raised bed gets used by the plants, none of it is wasted.
It also makes it easier to work on your garden, no more bending over to the ground!