The Chinese elm (Ulmus parvifolia) belongs to the genus Ulmus. Popular in the use of bonsai because it is easy to grow. Its strength enables it to tolerate some kind of maintenance errors. The Chinese elm is also often recommended for beginners. As a subtropical tree, it can be grown inside providing a very good light and it can be grown during winter in an unheated room. However after a few years the tree may be exhausted. That is why it is recommended to grow out during the summer and then let all year round outdoors. During the winter, it can be useful to protect the root ball of gel with bubble wrap and leaves and place the tree in a cold greenhouse. Make sure that the temperature does not go below -5 ° C. In a few years, it will lose its leaves and acclimated in the fall. Allow the substrate surface between waterings in light rain. Spray the foliage occasionally if the bonsai is indoors. Hardiness zones: Plant this tree in hardiness zones 5 to 8. It prefers full sunlight to partial shade. Soil Conditions Grow the Chinese elm in soil that is well-draining for best results. It is highly adaptable to varying types of soil conditions. It tolerates both acidic and alkaline soil, as well as soil that is not that fertile.