The term 'Art of Dwarfing Plants' refers to the practice of bonsai, a Japanese art form that involves growing and maintaining miniature trees in containers. Bonsai is an ancient practice that dates back to the 6th century, and it requires careful pruning and shaping of the tree's branches and roots in order to create a desired aesthetic. The goal of bonsai is to create a miniature version of a full-sized tree, and the art form has become increasingly popular in recent years.