About.com's Kerry Michaels says that even if you "think you have a black thumb or haven’t ever tried to garden? Container gardening is a great place to start. Even a complete novice can create a spectacular container. All you really need to get started is a container, some potting soil and either seeds or plants."
Great bang for your buck: You can use almost anything for a container. Space is not the final frontier: Even the smallest space can be enhanced by a container garden. Kids love it: My kids wouldn’t look at peas until they grew them and could eat them right off the vine. Something for everyone: With container gardening you can have great results being as relaxed or ambitious as you want to be.
Source -
http://containergardening.about.com/...ntainerwhy.htm