By Isla Quinn
I want to be upfront about the uncertainty here, because it’s the actual story rather than a gap in it. Jōmon Sugi’s age is estimated at somewhere between 2,000 and 7,000 years old, and I asked more than one guide on the mountain whether that range would ever narrow. Nobody thought it would, not with confidence. The tree’s interior is hollow enough in places that standard growth-ring dating isn’t straightforward, and the estimates that exist come from a mix of methods that all carry real uncertainty. It’s an unusually honest situation for something this famous — most landmarks get a firm number attached whether or not the number deserves the confidence.
The tree was found, or at least brought to wider attention, on 28 May 1966, and its scale did the rest of the work turning Yakushima into a hiking destination. I did the walk myself, and it’s not a casual afternoon outing — the trail climbs well up the mountain through forest so densely mossed and shadowed that it stops registering as ordinary woodland after the first hour and starts feeling like something closer to a fixed idea of ancient forest that most places can only gesture toward.
Yakushima’s cedars here get their own specific name, yakusugi, reserved for trees on the island believed to be at least a thousand years old — a definition that quietly acknowledges just how many genuinely old trees this forest holds, with Jōmon Sugi simply the most extreme and most famous example rather than an isolated anomaly. The forest’s significance was formalized in 1993, when Yakushima became one of Japan’s first Natural World Heritage Sites, a designation that’s protected the interior from the kind of development that’s reshaped plenty of comparably beautiful coastlines elsewhere in the country.
What I keep returning to, writing this up, is how little the uncertainty about the tree’s exact age seems to bother anyone who actually makes the hike. Whether Jōmon Sugi is 2,000 years old or considerably closer to 7,000, either number puts it well beyond any human timescale that means much on a personal level, and standing at the viewing platform below it, the exact figure stopped mattering to me almost immediately. What mattered was standing next to something that old at all, on an island wet enough, remote enough, and protected enough that it was allowed to get that old in the first place.
I came away without sourced, checked profiles of woodworkers using yakusugi material to offer Sephari readers — wood harvested from trees under this level of protection raises exactly the kind of provenance questions that need real answers before we’d put a name behind it, and I’d rather leave that gap honest than fill it with a guess.
Yakushima makers interested in a future profile can start at /sell-with-sephari/