Board Thread:Wiki Discussions/@comment-25050491-20140611171717/@comment-24479616-20140611220721

i think we have to view wood release on a more 'conceptual' level: Chakra is given the properties of both substance and mass (earth) as well as fluidity and moldability (water) at the same time, making it possible to create constructs which are tangible but can also be shaped in many different ways (in the form of timber like yamato uses it). Hashiramas use seems to also involve actual 'wood-cells', meaning they have plant DNA. He can probably make those parts of tissues in his body grow by infusing water and earth chakra into them, which act as nutrients for the plant cells.