Yingmu - Burl Also called Yingmu (Literally means shadow wood) or Huamu , got its name with its cloudy and curly looking grains resembling bud formations. Grown on the root or trunk of any trees, in oval lump shape or twisted knots, just like tumor. It is a natural insulation material. Some use it for smoking pipes and decorative components. Burl wood is usually available in planking less than 8mm thick. Length is almost always under 90cm, and width lower than 40cm. Supply of the old burl wood, taken from panels removed from demolished houses, is diminishing by time.