Miyama kaido is a Japanese term that refers to a group of wild crab apple trees that belong to the Malus genus and the Rosaceae family. These trees are native to the mountainous regions of Japan, from Hokkaido to central Honshu. They have small, fragrant white or pink flowers that bloom in spring, followed by red or yellow fruits that are edible but sour. Miyama kaido is often used as a bonsai material because of its attractive bark, foliage and flowers. It can be trained in various styles, such as informal upright, slanting, cascade or forest. Miyama kaido bonsai requires full sun, regular watering and pruning, and protection from frost.