I made a root over rock Bonsai from an exposed root Chinese Elm. It was a little fiddly, but I like the placement of the roots and the contrast with the stone. My humble little beginner apartment collection : r Bonsai Regionalverband Bonsai NRW e.V., Duisburg Arbeitskreise Wie lange hlt ein Sichtschutz aus Bambus? bamdis Ratgeber Bamdis How Long Does It Take For A Bonsai To Grow? Leaves and Soul