> the lumber produced in this method is 140% as flexible as standard cedar and 200% as dense/strong,
?
The strength & flexibility I would guess are attributable to the lack of knots and the straightness of the grain.
One thing both writers keep doing that's annoying is calling it a cedar. The tree is cryptomeria japonica, known as sugi, which in English is sometimes known by various misnomers such as "Japanese cedar" and "Japanese redwood," both of which should be taken as more poetic than scientific.
The lumber is dense/strong because the shoots have a robustness advantage due to being part of a mature tree with all its resources.
Some previous discussions:
Same discussion 3 years ago
Daisugi, the Japanese technique of growing trees out of other trees (2020) - https://news.ycombinator.com/item?id=37759366 - Oct 2023 (102 comments)
Daisugi, the 600-year-old Japanese technique of growing trees out of other trees - https://news.ycombinator.com/item?id=26941631 - April 2021 (171 comments)
https://www.agroforesterie.fr/la-trogne-arbre-paysan-aux-mil...
Other countries do it too :
https://en.wikipedia.org/wiki/Pollarding
[edit: clarification]
Somehow I keep thinking Mad Max where women were kept just to produce baby and milk, or Alien where alien "subtree" sprouted from human "tree".
I guess nature/human is cruel?
Also known as 'Thing, Japan'. HN eats up articles like this every single week.
And invariably the top comment is a "Thing Also in Europe/US" smugly citing that the commenter knows about something that's vaguely similar which happens to be in their neck of woods rather than Japan; and therefore makes the article irrelevant (this part is never adequately explained).
The most recent one I remember was reacting to something about konbinis by saying "So what, Poland also has lots of convenience stores".
Your comment feels somewhat reductive as well, you could basically replace "Japan" with a lot of things that are appreciated by some sizable subset of HN readers.
But, for some reason Japan does seem to inspire a certain fervor in both the otakus and weeaboos and their inverses. I think it's because it's the closest thing to an alien civilization for Westerners.
“It is a little different, more like pollarding, and it doesn't work with any other conifers than saplings from one specific mutant cedar in a shrine near Kyoto.”
If you do, I have got a great new travel destination. If you don't then everyone else (and hopefully you too) will understand why people think this is special enough to link beyond the fact that it happens to be in Japan.
> Necessity being the mother of invention, this led to the creation of an ingenious solution: daisugi, the growing of additional trees, in effect, out of existing trees — creating, in other words, a kind of giant bonsai.
It tries to sell something as completely unique. It’s not. For example this sentence should emphasize what’s unique with daisugi, because there is a very good English word with this exact same meaning as written in this sentence: grafting.
In LA those are either French or Italian women, selfishly hoarding all the good skin cream. I then wondered who the French and Italian women think are the beauty-secret-holders...
Grafting is joining cuttings from one tree to a rootstock of another. That is not what's going on here at all, it's limited to a single tree.
Something like "selective pollarding", maybe, but that's very far from being a common English word. And as I said, most pollarding I have seen is nowhere as straight and tall as this.
In fact, most trees called cedars are NOT Cedrus.
With a few narrow exceptions most timber crops in the the UK are monocultures or very limited mixes of pines/spruces/firs which outside of nesting season support very limited ecosystem. Even then the management plan for the site would have to account for species present and respond accordingly. Badgers? 20m no go zone from their sett and it may involve another license from Natural England.
I tend to operate at the border of woodland management and forestry. Coppicing typically tends to fall into the woodland management category due to the smaller scale nature of it, especially for when it is for "green woodworking" or craft use. The larger scale biomass coppice sites are very firmly in the forestry size, but still retain the ecological benefits to an extent.
[0]: https://www.forestresearch.gov.uk/research/continuous-cover-...