Bonsai are miniature trees grown in pots. The aim of bonsai culture is to develop a tiny tree that has all the elements of a large tree growing in a natural setting. Bonsai, as an art form, stems from ancient oriental culture. It originated in China and was developed by the Japanese. In the 13th century, the Japanese collected and potted wild trees that had been dwarfed by nature. These naturally formed miniatures were the first bonsai.Not all plants are equally effective as bonsai. To produce a realistic illusion of a mature tree, look for plants with the following characteristics:• Small leaves or needles.• Short internodes, or distances between leaves.• Attractive bark or roots.• Branching characteristics for good twig forms.All parts of the ideal bonsai — trunk, branches, twigs, leaves, flowers, fruits, buds, roots — should be in perfect scale with the size of the tree. Plants used for bonsai should have small leaves, or leaves that become small under bonsai culture. Plants with overly large leaves, such as the avocado, will look of proportion if chosen for bonsai. Sycamores also develop leaves that are too large. Certain species of both maple and oak trees usually respond well to bonsai culture and develop leaves that are in proportion.Bonsai are kept outdoors most of the year, but — from time to time — these miniaturized versions of nature are brought indoors for display. Only certain tropical trees, shrubs, and vines can be continually kept in- doors full time as bonsai.