What are the world's smallest trees?

The smallest tree in the world is the Dwarf Willow (Salix herbacea) also known as the Least Willow or Snowbed Willow and it is commonly found in Greenland. It grows in tundra and rocky moorland and typically grows to only 1-6 cm / 2 inches in height! It is the most common of a group of tiny creeping willows and is adapted to survive in harsh arctic and sub-arctic environments including both sides of the North Atlantic, Arctic northwest Asia, northern Europe and eastern Canada, and further south to the Pyrenees, the Alps, the Rila in Europe and the northern Appalachian Mountains in New York.