Many horticultural and aesthetic decisions go into achieving the true goal of bonsai: nurturing and training a tree in a container to appear as it would in nature. One such decision—and one that encompasses both horticultural and aesthetic considerations—is determining which style a bonsai should follow. In nature, trees grow in a variety of styles—consider the upright style of a redwood tree versus the cascading foliage of a willow tree, for example. The way in which a tree grows is often determined by their environment, and as a bonsai artist, I look to honor that environment, and the way in which that tree would grow in nature, when determining how to shape and style a bonsai. Those decisions and determinations can be seen firsthand when viewing the variety of bonsai we have in our new bonsai display near the Green Wall in our Conservatory.
The centuries-old Japanese art of bonsai originated in China as the practice known as penjing, or the art form of creating landscape scenes on a miniature scale. Throughout the years, many styles to classify bonsai trees have been developed to closely resemble circumstances in nature. These styles, however, are not hard and fast rules, but open to personal interpretation and creativity, meaning that bonsai trees do not need to conform to any particular style. The styles exist, however, to help serve as guidelines when shaping a tree and honoring its natural environment.
It's possible that bonsai can be trained into different shapes throughout their lifetime. Sometimes artists restyle a bonsai simply because of a changing of hands between the previous and current artist; sometimes a style needs to change because, for example, a branch dies and the tree’s composition needs to be rebalanced.
Just as styles themselves are open to personal interpretation, so are the groupings and definitions of bonsai styles—in fact, there’s much variation among bonsai artists in just how many bonsai styles really exist. Many subscribe to the belief that there are five basic bonsai styles, each derived from the tree’s angle of growth from a container.
The first of these five basic styles is known as formal upright or Chokan. The formal upright style is considered the most common of bonsai styles and follows the tree’s natural design in an upright growing manner. Many formal upright trees in nature grow in an open location without much competition for light. The trunk line is perfectly straight and vertical, with the apex (or top of the tree) located over the center of the trunk base; the trunk must also taper from base to apex, meaning its thicker at the bottom, then thinner as it goes up. To achieve a tapered trunk, the bonsai artist must make a series of cuts to the apex. The apex is cut off and an adjacent thinner lateral branch is oriented or wired upwards as the new top. This process is continued multiple times over many years. Each branch is shorter than those below it.
The second of the five basic bonsai styles is known as informal upright or Moyogi. This style depicts a tree in nature that has been affected by the elements, such as wind—with those effects shown in its a non-linear trunk line in contrapposto, meaning the main trunk goes one way and the apex returns back to the center over the top of the base of the tree; it’s an asymmetrical balance like what you would see in a contrapposto pose of the human figure. This style is very common in both nature and in bonsai. The tree must also have a central location in the pot. To achieve informal upright style in bonsai, one can create movement through the use of wire, or can start with a tree that already shows such effects of nature.
Slanting style or Shakan refers to trees that have tilted to one side, often as a result of wind or water in one dominant direction or by the tree reaching for sunlight. As the tree slants, it develops a well-developed roots system on one side so the tree can remain standing. While the trunk can be slightly bent or very straight, it still must be thicker at the bottom than at the top. When it comes to the branches, the first branch must grow in the opposite direction of the tree, so the overall tree achieves visual balance.
Cascade style or Kengai is true to a tree on steep cliff that bends downward, resulting from such factors as falling rock or snow in nature. In bonsai, cascade style trees can be planted in tall pots, or more often in a shallow container with a stand, to maintain their direction of growth—which is opposite to a tree’s natural growth toward sunlight. Cascade-style bonsai grow upright for a small bit, but then cascade downward—but must never touch the surface on which it is displayed.
Semi-cascade style or Han-Kengai is also representative of trees found in nature on cliffs or banks. Just like cascade style, these trees feature a trunk that grows upright for a bit and then bends downward beyond the rim of the container or perhaps sideways. Differing from the cascade style, however, is that a semi-cascade trunk never grows below the base of its container.
A number of additional bonsai styles are considered modifications of the five basic styles. For one, broom style pertains to a straight, upright trunk, along with branches and leaves that form a radial crown at the top. This is a common style seen in many deciduous trees in our region.
The literati style or Bunjingi reflects trees found in densely populated areas in which a tree tries to grow taller than all of its counterparts in order to thrive. The trunk grows crooked as it grows upward, and does not feature branches as the sun can only hit the top of the tree. In many cases, trees in the literati style feature very delicate trunks with a lot of movement. Many types, the apex is off-centered.
The forest style or Yose-ue is made up of three or more trees planted in a natural, staggered pattern resembling a forest. Trees of different heights are arranged at different distances from one another. The overall effect resembles a forest canopy. Traditionally taller trees have been placed in the front and center with smaller on the sides and back. This aesthetic has shifted with contemporary bonsai. Asymmetrical forest design with tall trees at multiple points is now being explored, with the smaller trees in the back or on the sides giving the illusion of depth.
The raft style or Ikadabuki emulates a tree that has been blown over in a storm. The tree’s roots then develop from the resting trunk and the remaining branches grow to resemble new trees still connected to the old trunk and all from the same root system. To achieve this style in bonsai, a tree is potted horizontally and the side branches become the new vertical leaders of the tree. Then the branches are styled like a forest design with dominant and subdominant apexes. With both raft and forest design, multiple tree heights, trunk thicknesses, and a three-dimensional approach (non-linear) planting is desired for a natural look.
Come see these bonsai styles for yourself in our new bonsai display near the Green Wall in our Conservatory. We regularly update the bonsai on display, so you’ll be treated to a variety of styles—but constant bonsai beauty.