We know someone who is blogging his EarthBox adventure this summer - a Chicago rooftop gardener who is determined to have fresh veggies no matter what and he's using the EarthBox to do it. People love these things.
The EarthBox is based on ideas developed for commercial farmers to ensure good yield even when conditions are not ideal (like on a rooftop...). The design makes planting simple - you are forced to add only the right amount of water and soil. Instructions are specific on how many plants to begin per box, depending on what you want to grow. A water reservoir with an overflow hole means you won't over water, and a mulch cover protects the soil/fertilizer from wind and intense sun (thinking rooftop again).
We'll be keeping an eye on Raised on the Roof over the next couple of months for a test of a real-time Chicago growing season - just how many brussels sprouts can he grow on that roof anyway? Watch for the updates...
EarthBoxes available here.