Wood Release: Wood Giant Technique(木遁大男術, Mokuton: Ōotoko no Jutsu) is one of Zenkichi's most notable techniques. To use this technique, he will createalarge amount of trees, or use an existing forest. He will then use this Flowing Roots Technique to connect himself to the forest, followed by clapping his hands together, thus channeling his charka though the entire forest. This causes the forest to be pulled toward him, interlocking and merging to form a wooden giant, who's size is equal to the size of the forest used. Zenkichi, resting inside is able to manipulate it much like his own body
It is capable to within standing a large amount of damage. Zenkichi is able to repair it at will. The giant, is known to be possess different effects depending on what "forest" is used to make it up. In addition to this, due it being made up of his chakra, he is able to use it to increase the scale of his techniques. By using the Ironbark Technique, Zenkichi is able to protect it from fire attacks.