Vertical Landscapes?

Recently I posted an article from the TreeHugger website which featured buildings covered with plants. There were a lot of people who expressed interest in it, at least I received many feedback in school. Most of them asked about the types of plants that can be used here in the Philippines. There were also those who asked about any projects in the Philippines that has these features.

I passed the questions to a friend who is an advocate of Permaculture. Unfortunately he has no answers for me yet. He suggests that we simply observe what types of plants grow on walls and make cuttings.

His suggestion made me wonder whether landscape architects and LA students consider green walls as part of their practice. Is there such a thing as a "vertical landscaping"? How convenient it would be for our landscape department in school to take on the task of cataloguing all the plants that can be used for this purpose.

The best way is to throw this idea to our graduate students specializing in landscape design.... a possible thesis?.... hmmm...