Periodically the overgrown tree will be trimmed back, given a haircut to bring the design back to a more compact design while also keeping the needed branches and eliminating the ones that are not necessary. This process is repeated until the later stages of a bonsai’s maturity.
Once mature and the design is set growth is kept more restrained. The cycle of growth followed by trimming back is kept up for many years until the tree hits maturity when a more restrained growth and tim back cycle begins.

Willow Leaf fig that has been allowed to grow wildly in order to strengthen it, provide more branches for the design and to thicken the roots draped over the rock