I ordered some from bonsai Jack on Amazon. They ship quick, are much cheaper than most other mixes I've seen this far, and they ship 1 quart up to 5 gallons. You can also get the aggregates individually if you don't want a ready-to-pot mix.

Hey, dude. Can you post some pictures so we know what you're working with? Also, I'm not sure exactly what you're asking. A grow box is technically a bigger pot, so what you read doesn't seem to be in conflict with the note that came with your maple. In any case, I'm commenting must to follow this discussion since I have 4 young maple Yamadori I'm not sure what to do with either.

How'd I do? I think I messed up that side cut. It's too flat still. I tried to round it off per that chopping 101 PDF, but there just wasn't enough to work with. I think I cut it too close to the trunk.

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@Andy Berry I'm so glad to hear you say that! After making this initial part, I went back to my parent's house to scope some trees with a more informed eye. Indeed, they are all clumps. Everything I looked at that seemed small enough to collect was a sucker stemming out from a larger tree. I can't help but wonder if it's possible to pull the soil away from the sucker, start an air layer with sphagnum miss, and then bury it again for the season. In any case, There's no rush on the fire mitigation and I'm happy to accept all the help I can get. What's your email address so we can set something up and go collect some trees for me you and anyone else that wants in?