A single, multi-millennial organism
On the remote Japanese island of Yakushima, at an altitude of 1,300 meters, stands a colossal tree known as Jomon Sugi. This ancient specimen of Cryptomeria japonica, or Japanese cedar, is a single tree and the center of a clonal colony. The main trunk measures 25.3 meters in height and has a massive circumference of 16.4 meters. Scientific analysis, including radiocarbon dating of its branches, confirms a minimum age of 2,170 years, though estimates range as high as 7,200 years. The upper limit is constrained by the geologic history of the island; a massive volcanic eruption is thought to have destroyed most life on Yakushima about 7,300 years ago.
A feature of Jomon Sugi is its method of propagation. The ancient central tree is a genetic parent to a dozen surrounding trunks. These are not offspring in the traditional sense, produced by seeds. They are genetically identical clones. This form of vegetative reproduction, likely achieved through a process called layering where low-hanging branches make contact with the soil and develop their own root systems, has allowed this single organism to persist for millennia. The entire group functions as one individual, sharing the same genetic code.
The science of survival
The longevity of Cryptomeria japonica on Yakushima is a product of its harsh environment. The island receives some of the highest rainfall in the world, with some areas getting over 8,000 mm annually. This, combined with low soil nutrition on granite bedrock, forces the trees into an incredibly slow growth pattern. This slow growth results in the production of a very high concentration of resin in the wood. The resin acts as a powerful preservative, protecting the tree from decay and disease, which is why even the stumps of cedars felled centuries ago remain in the forest.
Jomon Sugi's gnarled, irregular shape is what saved it from logging during Japan's Edo period (1603-1867), when the straight-grained wood of other cedars was highly valued for roofing shingles. The tree was officially "rediscovered" in 1966, an event that sparked conservation efforts and led to Yakushima's designation as a UNESCO World Heritage site in 1993. Today, to protect its shallow root system from the impact of tourism, visitors can only view the tree from a specially constructed observation deck located 15 meters away.