The large roots were cut back, while trying to keep as many fine roots as possible. I was careful to keep the fine roots that emerged from the gaps in the nebari, they are very valuable roots. Probably could have been more aggressive, but there's always next time. Cutting back to get it to fit in a pot and then rebuilding vigor is the name of the game at this stage.
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A large colander will serve as a pot while it's in development. Started with a drainage layer of geolite, commonly used in hydroponics.
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Followed by around 1.5 inches of soil (Boon's mix) and then the tree.
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Top off the soil, working it in with a chopstick, and we're done. I'll put it in the sun for now to keep it warm, roots enjoy the warmth...
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That's about all for now. It will be protected from any late frost, and watched carefully during the growing season. It will be allowed to grow freely this year to rebuild vigor. The smaller (North facing) branches will be allowed to thicken to catch up to the fatter (sunny South facing) branches.
Any comments are welcome, from styling advice to critiques if my work!

Cheers,
-Matt