How to Make a Petunia Tower -- Basically, it's a ring of galvanized fencing lined with landscape fabric, then filled with potting soil. The petunias were planted through slits in the landscape fabric. This looks like a pretty easy do-it-yourself project!
Houseplants for the Forgetful Gardener - Indoor conditions can be tough on plants, especially during winter when low humidity dries out potting soil quickly. To ensure success, look for houseplants that can take periods of drought. And try potting them in large containers; the smaller the pot, the more quickly it dries out.