Curly birch is also known as Karelian birch, Masur birch or Birch burl. Curly birch's grainy pattern wood belongs to the world’s ten most expensive among precious woods. Curly birch is not considered an endangered species because it is a genetic variation (mutation) of a silver birch, which gives the tree its unique pattern. Cultivation of these trees is environmentally friendly since this valued wood originates mainly from former agricultural areas. Most of our plantation curly birch trees are certified clones of the most famous Finnish curly birch tree called “Visa Kuningatar".