When I had a house, I used to have a dozen earthboxes on the back patio and they worked great. I don't have any outdoors space anymore, so the only gardening I do now is in small glass containers. I made these 2 terrariums with a woodland scenery this week:
Wow, those are gorgeous!
Container gardening outdoors is a great idea for any size property. Most vegetables and annual flowers only need 6" to 8" of soil. As freebird posted they can move their container into an enclosed porch to extend the growing season. I also like containers because you can add height, splashes of color or texture to established garden beds.