
Konstantin Kirsch interest in Permaculture and the discovery of Arthur
Wiechula's drawings and writings, led to the belief that, through
patience and dedication, a grown house will become reality.
He started growing his first tree dome in February 1989. The tree
species
was willow, unfortunately due to lack of water the willow didn't grow
well. For his next major project he decided to use bare root ash saplings. He
wove these saplings into a diamond patten to form the walls.This
project is a five bedroom tree dome.
He has written a book about how to grow a home. The title is Naturbuten which means Naturebuildings. It is now in full
colour and availableto buy from his site. For the time being, it is only available in german language. 
Quote from Konstantin Kirsch web site.