You ever see a dog that’s got its leash tangled the long way round a table leg, and it just cannot grasp what the problem is or how to fix it? It can see all the components laid out in front of it, but it’s never going to make the connection.
Obviously some dog breeds are smarter than others, ditto individual dogs - but you get the concept.
Is there an equivalent for humans? What ridiculously simple concept would have aliens facetentacling as they see us stumble around and utterly fail to reason about it?
I’m sure it was just that no one realized it would scale to trees, since that hadn’t been done before. As far as I know you don’t have to do anything special in that regard with small seed-grown plants in a green house, only cuttings that root from stems, and so have weaker roots at first and stalks that were previously branches. I’m sorry I sounded critical, I was just curious.