Board Thread:Naruto Discussions/@comment-24847491-20140921145042/@comment-4688597-20140924191812

Jashin Uchiha wrote: Riptide240 wrote: Do you even know why Yamato has Wood release? He has hashirama's cells like everybody else who uses wood release Only Hashi has Ashura's Yang, Yamato isn't Ashura's reincarnation. Everyone who uses wood release has Hashirama's cells, yes, but that's because only his DNA has the coding for the ratio of Earth to Water necessary to make Wood.

Well technically, wood release is turning the user's chakra into the source of life for the plants to use as a medium for them to grow. That's why I personally think it's attributed to his whole Asura chakra/Yang/life force thing.