Rachel Sussman: The World's Oldest Living Organisms - The Long Now

Lichen in Greenland grows 1 centimeter every 100 years. So a large specimen could be dated to 3,000 years. In the Atacama Desert at 15,000 feet in Chile, a shrub called La Llareta grows only 1.5 centimeters a year and is so dense you can stand on its leaf structure.