Posted on October 8, 2014 by James GielowA freshly trimmed and defoliated Chinese Elm bonsai This Chinese Elm is such a hearty bonsai as well as an aggressive grower. It needs to be trimmed about twice a year. I like to wait until fall to make the job easier. Chinese elms are deciduous, so they drop their leaves in the fall. This allows you to better see the ramification of the branches for easier training.