Chinese Elm didn't Lost its Leaves in Winter

Hi all,

I have a Chinese Elm bonsai. Last winter the Elm didn’t lost all its leaves (I understand it is common on Chinese Elms depending on local climate). Now I am preparing for winter season (I live in Chile) and I would like to know if it is recommended to manually cut the leaves didn’t fall by themself.

I really appreciate your advices!

Thanks in advanced,
Wilson.

I live in California and sometimes they are evergreen. In the southern part of the state they are called evergreen

Elm and normally we let them drop naturally in the spring