Silk Smilax Tree Branches. Silk smilax branches are great for replacing your older branches with new silk tree branches to give it a new look or if you just want to make your own silk tree. Artificial silk smilax tree branches are not made from real silk. Silk tree branches are made from synthetic fabrics, plastic coated iron wire and are not made of any real silk. Silk Smilax Tree Branches come un-shaped.