Formal Upright Bonsai Style
The formal upright style is a very common form of Bonsai. This style occurs often in nature, especially when the tree is exposed to lots of light and does not face the problem of competing trees
For this style, tapering of the upright-growing trunk must be clearly visible. The trunk must therefore be thicker at the bottom and must grow increasingly thinner with the height. At about 1/4 of the total length of the trunk, branching should begin. The top of the tree should be formed by a single branch; the trunk should not span the entire height of the tree.