This is the shocking truth according to Martin Naudet, xmas tree plantation owner in Planchez, France talking to the BBC as chemical-free xmas trees costs more and do not look good enough for customers. The obvious, eco, option is NOT to have a Christmas tree. You could just decorate another house plant, a small boat (as they still do in some parts of Greece) craft something that looks like a tree from recycled stuff, or search online for 'xmas tree alternatives'.