Started this from a random seed found on a street about 5 years ago. Today is the first transplantation, if it survives, it's brothers and sisters will follow! Not sure it's optimal time for spruce transplantation, but the previous planter was 4 times smaller (soil footprint could be seen in center, with intact moss layer).
This is awesome! I've never had luck getting trees to grow from seed.
The best time to transplant trees is usually in the late fall or early winter. You want to do it after letting the tree acclimate to the temperature. So a few weeks before you want to transplant it, put it out at night and bring it back in during the day.
Oh, these plants are outdoor bonsai, these trees are perfectly accustomed to this climate (thick snow, -30C, some sunless days, etc) and totally do not tolerate indoor tropics.
I tried transplanting some local trees in the fall, as textbooks say, and they perished pathetically. The best time must be some other time. I suppose the best time should be early spring when roots did not wake up enough, but then I might need to break ice. Then now is fast growth slowdown moment, I suppose it must be the next best bet. I'm doing one at a time now!