By winding suitable wire around branches or even the trunk of the tree, it is possible for the bonsai artist to create bends which are pleasing to the form of the tree. When the wire is removed some weeks or even months later, the shaped area will remain in that form.
The best time to wire deciduous is in late spring through autumn. Evergreens such as pines and junipers are best wired in winter.
Annealed copper wire is best for evergreens due to its superior holding power. However the material of choice for deciduous is anodized aluminium wire.