In anticipation of bringing these guys back inside, I cut them back a few feet so they fit in the grow tent. 8 months from germination, these seem to be doing ok. Trunk is about 0.5 inches. One has some subtle movement.
Soil has an odor. It's not rot and suspect it has something to do with the nitrogen fixing bacteria.
Tree seems to be able to take a decent root pruning and keep ticking.