He reveals in passing that Los Alamos is Spanish for poplar tree. The second way is through the transplanting of a cutting of an infected poplar tree. Siyang is famous for its poplar tree. All of his plants die, except for one poplar tree. Soap was made from boiled poplar tree ashes mixed with caribou fat. He was buried at the seashore under a poplar tree. Big Poplar Tree is an unincorporated community located in Woodford County, Kentucky, United States.