When branches on deciduous trees break, the leftover bit may rot away, leaving a hollow in the trunk. When this is created in bonsai, it is called an uro: A hollow in the trunk.
Grow your own miniature tree
When branches on deciduous trees break, the leftover bit may rot away, leaving a hollow in the trunk. When this is created in bonsai, it is called an uro: A hollow in the trunk.