In this episode of Around the Home, SpiffyGuy show's how to construct a garden barrel capable of housing 50 plants in a four square foot area. It includes a worm composting tube as well.
He took a lot of inspiration from Sherrie on her Half-Pint Homestead video (also on YouTube).
I am hoping it is a compact way to grow organic vegetables and compost at the same time, so I will be trying this out this growing season. Look for my video on the project.