How to Choose a Bonsai Pot | The Basics of Matching Pots to Tree Species and Shape

Bonsai is not only about cultivating the tree but also about selecting the right pot to complement it and completing the composition as a unified landscape. Since the same tree can appear dramatically different in another pot, pot selection is regarded as a crucial finishing touch in bonsai. Here, we organize the fundamental principles of choosing a bonsai pot from the perspectives of tree species, tree shape, and size.

The Basics of Using Unglazed and Glazed Pots

Bonsai pots are broadly divided into two types: unglazed pots (called doromono) and glazed pots (called irobachi). Unglazed pots have a simple, subdued texture and have long been favored for showcasing the strength and aged appearance of conifers such as black pine, five-needle pine, and hinoki cypress. The earthy, fired finish of unglazed pots harmonizes naturally with the substantial trunk bark and textured appearance of conifers.

Glazed pots, on the other hand, are often paired with deciduous trees such as Japanese maple and zelkova, flowering specimens like azalea and camellia, and fruiting bonsai. The pot's color plays a role in highlighting the seasonal foliage, flowers, and fruits. For example, pairing a pale-colored pot with the fresh spring foliage of Japanese maple and switching to a contrasting color during autumn foliage is one of the unique pleasures of bonsai. For tree species with distinct flower colors, such as azalea, subdued-colored glazed pots that don't compete with the flowers are typically chosen.

Selecting Pot Depth Based on Tree Shape

Pot depth should be selected to harmonize with the tree's shape. For common styles such as straight-trunk and informal upright, a slightly shallow pot relative to the tree's height is standard and helps contain the tree's presence within the pot in a balanced way. Conversely, for cascading and semi-cascading styles where the trunk droops from the pot's edge, a deeper pot is the norm—ensuring the drooping branches don't extend below the pot's bottom. Using a deep pot creates balance between the hanging branches and the overall pot, allowing you to express a landscape where the tree naturally cascades from a cliff.

Balancing Tree Size with Pot Dimensions

Pot size is judged by how well it balances the tree's canopy spread and trunk thickness. As a general guideline, the pot's length (or diameter) should be roughly two-thirds the tree's height, and the pot's depth should be close to the trunk's diameter at the base for good harmony. However, this ratio is merely a starting point; actual pot selection involves fine-tuning based on tree shape and the impression you wish to convey.

A pot that is too large diminishes the tree's presence, while one that is too small creates a cramped and unstable appearance. Especially when repotting into a new pot, considering not only the tree's current canopy but also how it will develop over the coming years helps avoid frequent pot changes.

Drainage and Pot Base Structure

Beyond being a display vessel, a bonsai pot is a functional container for healthy plant cultivation. Drainage holes are provided at the pot's base, and the size and number of these holes directly affect soil drainage. Unglazed pots with their raw terracotta finish have porous walls that promote air circulation, preventing root rot—a practical advantage. During repotting, using a pot screen to prevent soil from escaping while keeping drainage holes unobstructed is an important consideration alongside pot selection.

Perspective on Pot Selection

There is no single correct answer to pot selection, but the fundamental approach is to consider how the tree's trunk color and texture, the delicacy of its branching, and seasonal foliage and flower colors harmonize with the pot's color, texture, and shape. As you try multiple pots with the same tree over time, selecting the one that best suits its seasonal state, you'll develop your own sense of pot matching. Beginning bonsai enthusiasts should start with the basic framework of using unglazed pots for conifers and glazed pots for deciduous trees, flowering species, and fruiting bonsai, while physically trying the tree in candidate pots and viewing the overall composition from all angles.

Compatibility Between Pot Shape and Tree Form

Bonsai pots come in various shapes, including round, rectangular, square, and oval forms. As a general rule, rectangular pots enhance the strength of upright, straight-trunk forms, while oval and round pots tend to suit informal styles with gentle curves or multi-trunk clumps with a softer appearance. Of course, this is a broad guideline, and the overall impression changes depending on trunk thickness and branch spread, so physically placing the tree in candidate pots and viewing from all sides to confirm overall balance is essential. The rim shape and height of the pot also affect how the tree's roots are displayed; if you want to showcase attractive root placement (nebari), choosing a pot with a low, stable rim is a common approach.

Summary

Selecting a bonsai pot is a comprehensive task that involves distinguishing between unglazed and glazed pots, choosing appropriate depth based on tree shape, balancing tree size with pot dimensions, and considering practical drainage. By selecting pots that respect the individual characteristics of each tree species—conifers like black pine, deciduous trees like Japanese maple, and flowering specimens like azalea—you create a unified landscape where tree and pot become one. For details on available tree species and pots, please check our online catalog.