When we think of any garden the first and foremost requirement would be have soil since one cannot imagine growing plants without a medium which is generally the soil. But in Mangalore a popular and well known Physician and a Professor , also a garden enthusiast grows plants without soil but using coco peat ( wood, leaves and other degradable material) . I have visited Mr Bhat's house and garden since his wife Vasanti is a friend of mine. It is well cared for and lovingly maintained by the entire family ..Please read the article to get all the details !
http://www.mangalorean.com/gardener-dr-ks-bhat-grows-plants-using-no-soil/