These are bonsai which have the roots of more than three of the same plant connected, or in which the tree has fallen down and been buried in the earth, and what was once a branch is grown as the trunk, and the base of that branch sends out roots which are connected with the other roots.
3本以上の複数の同樹種の根が癒着して1つに繋がっているもの、または立木が地面に倒れて地中に埋まり、元は枝であったものが幹として育ち、その枝元からも根を出して、根が一つに繋がっている様な多幹樹形である。