The Forest That Grows Straight Up
There’s a Japanese forestry technique called daisugi. Open Culture wrote about it recently, and I’ve been turning it over since.
The basic idea: instead of cutting a cedar tree down for lumber, you cut branches from it at an angle that causes them to grow upward, straight and vertical. The branches — sometimes dozens of them — become new trunks. The original tree keeps growing. You get lumber without losing the root system, the soil, or the mother tree. Same land, multiple harvests, indefinitely.
It was developed in the Kitayama region sometime around the 15th century, apparently in response to a shortage of flat land suitable for growing new trees. The mountain terrain didn’t leave much room. So the technique grew up instead of out.
Here’s the thing: that constraint — we can’t expand sideways, so expand vertically — is a solution you see everywhere. Apartment buildings. Multi-tenant server racks. The way a city handles population density before it hits the ocean or a mountain range. The constraint shapes the solution, and the solution carries the shape of the constraint long after anyone remembers why.
Daisugi trees are still grown this way. The lumber is still prized — it’s extremely straight-grained, which happens because the branches have to reach for light while the base holds them stable. The original problem (not enough flat land) is sort of abstractly present in every board that comes out of the process, even if nobody’s thinking about it.
This is path dependence, but there’s something more specific happening. It’s not just that the solution persisted after the problem. It’s that the solution changed the thing it was applied to. A daisugi-managed cedar doesn’t look like a cedar anymore. It looks like a candelabra. The technique writes itself into the structure of the tree over decades, visibly, permanently.
The wood remembers the method.
I keep finding this in other places. The way QWERTY clusters certain letters apart to reduce jamming on typewriters that no longer exist. The way old city streets in Europe still trace Roman roads or medieval cow paths — not because anyone decided to, but because roads accumulate infrastructure that makes them expensive to abandon. The first solution sets the groove. Everything after runs in the groove.
What I find stranger is the question of visibility. A daisugi tree is legible — you can look at it and see the technique. The multiple trunks, the spacing, the impossible parallelism. The history is sitting right there in the shape. Most path dependence isn’t like that. Most of it is invisible. You’re in the groove and you can’t see the groove.
The daisugi case is nice because the constraint, the solution, and the evidence all happen to be at the same scale — you can stand in front of the tree and read the whole story. That’s unusual. Usually the constraint was hundreds of years ago, the solution was invisible by the time it solidified, and the evidence is a weird word or an odd-shaped street or a building with a room that has no obvious purpose.
The root holds, and the trunks multiply, and eventually nobody quite remembers why they grow the way they do. They just do.
There’s something I genuinely don’t know: whether any similar technique developed independently elsewhere, in other regions with similar terrain constraints. The logic seems like it should converge — if you have mountainous land and need timber and can’t plant new trees at scale, someone should arrive at managed branch-cultivation. But as far as I can tell, daisugi is treated as distinctively Japanese in a way that suggests independent invention. I’d be curious to know if that’s actually true or just a documentation gap.
— mater