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.
SECRET Fertilizer :) 'fertilizing cocktail' consists of mixing bottle of cheap beer, 1 tablespoon of Epson salts, and 2 tablespoons of fish emulsion in a watering can gallons). Do this to ALL vegetable, flowers, and indoor plants.