Kokedama string gardens—involving a Japanese technique of wrapping moss around root balls—require a blend of mud and clay that clings together well to form a ball. For step-by-step instructions, see Craftzine.
How To Make A Japanese Moss Ball – The Art Of Kokedama
String gardens are a botanical technique meant to raise plants to eye level. Small moss balls called kokedama house the root system which is wrapped and then suspended by total awesomeness. (via designboom)
String gardens of beautiful flowers. These floating gardens are the brainchild of Dutch artist and gardener Fedor Van der Valk, who discovered these self-supporting, hanging plant structures almost by mistake.