Make Your Own Arbor.Step by step instructions on how to make a twig arbor. Tells you how many twigs of each length and what materials are needed. Has photos and instructions. Best in upper garden as visual magnet.
Just stick long willow branches directly into the ground, tie them together into the desired shape and they will root and grow, producing a cover of green leaves over the structure. Living Willow Structures, Fedges and Living Fences - North America