"The plants above are growing in a thin layer of felt and rock wool material instead of soil. Recycled rain water is pumped through this material to provide nutrients to the root systems of the plants." via green home building
Reuse an old tree to make a log pathway in your garden. Good use of "yard" trees and other wood that can't be milled; works much better in climates without termites. Good drainage under the log rounds will make the path last longer.
Credit: DK - Garden Design 2009 Dorling Kindersley Limited Gravel and Stones In this contemporary courtyard, carefully chosen rocks and stones form a sculptural route across gravel and moss. The vertical lines of the trees offer a balancing contrast.