[refuse]

We've already got super trees (genetically improved). These are selectively bred trees, not GMOs; stuff that gets super site-specific, like 'north side of a hill within 100ft of a stream'. IIRC Weyerhauser pioneered the work in this area...I want to say back in the 60s. They've reduced the time from planting to harvest substantially, something like ~80 years to ~30, and the new stuff is just growing faster.

The main problem is that the growth rings get huge, the lumber is technically stronger, but it's much denser and not well suited for all applications. If you look at old growth, you see sub-mm growth rings in Doug fir, and it's very light. Super trees can be quite substantial, like 1/8 to 1/4 inch. I've heard they burn hotter and more readily too. In my personal experience, old growth will burn all night in your stove but the younger stuff won't last half as long.

Been a while since I've poked my nose into forestry, I've probably got some of the details wrong but that's the gist of it anyway.

[robbiep]

I think you have the new = denser, old = lighter backwards? Old growth is denser, new growth is lighter

[refuse]

I seem to recall the fatter growth rings they put in on spring/summer increasing the density of the wood.

You could be right though, I'm having trouble finding it on Google tbh.

The main thing is that the wood quality is different because they want to maximize quantity over quality.

[Ericson2314]

Cross laminated mass timber is highly processed and I would think they would be able to work around this.