Trees so far, made from air drying white modelling clay. Based on Bamboo tree.

Clay rolled up to the length of 9ft scaled down.  Was going to do it to the scale on average of a real tree but these would look too huge.

Tree with two extra layers on to make look more realistic. This clay wasn't very good to work with, kept crumbling, then when using water got too soggy. But i persisted with it .

Once they had been sanded down using sand paper, the clay work quite well and the trees became extremly smoother.