All you need is a small amount of vertical space around a balcony or an open window which can hang or store a vertical array of drink bottles that can grow all your herbs and lettuce easily. Recycle as many of your plastic drink containers.
DIY: 5 passos para fazer uma horta caseira! - Constance Zahn
A few wooden lines attached to a plant holder, in random fashion, is the easiest way to beautify the white walls of a small balcony. Again, different plants in pots of various shapes and sizes lends an effortless quirky twist.