Koyo Bonsai Trunk Splitter

A trunk splitter is designed to create controlled fractures in thick branches or trunks. This allows you to bend rigid wood into dramatic shapes or split a single trunk into multiple sections for complex styling techniques like creating shari.

While it is professional-grade, it is suitable for any enthusiast ready to move beyond basic pruning. However, because trunk splitting is an invasive technique that stresses the tree, we recommend practicing on sacrificial branches or nursery stock before using it on a prized specimen.

The high carbon steel blade offers superior edge retention and precision, but it is susceptible to rust if left wet. Always wipe the blades clean with a light coat of camellia oil after every use to prevent corrosion and keep the tool in top condition.

It is highly effective on most woody bonsai species, but you should exercise caution with brittle woods or trees that are currently weak. Always assess the health and flexibility of your specific tree before attempting significant structural changes.

The 8-inch length is the industry standard for this type of tool, providing an optimal balance between leverage for splitting thick wood and the maneuverability needed to work within the dense foliage of a bonsai.