The crown of a bonsai tree is the part that contains the branches and leaves. It is usually shaped and pruned to create a miniature representation of a natural tree. The crown can have different styles, such as formal upright, slanting, cascade, forest, or broom. The crown should be balanced and harmonious with the trunk and the pot. The crown is the most visible and expressive feature of a bonsai tree, and it requires careful attention and maintenance.