Are there proven propagation techniques for bamboo?
A good overview of various propagation methods, i.e., offset, rhizome, culm and branch cutting, layering, and macroproliferation methods is provided in the INBAR publication: A Manual for Vegetative Propagation of Bamboos, 1995, by Ratan Lal Banik. The publication can be ordered from INBAR. INBAR affiliates can download the publication free of charge.