If it's a plastic pot: drill some holes, put some bolts in there and secure the tree to those bolts.
Then place rocks around the pot. Not in it. Tall pots with tall trees tend to blow over entirely, and then you'll lose half of your soil. You can scoop 75% back into the pot, but that other 25% is going to stay somewhere in the dirt. Over time, you'll end up with no soil left if you don't secure the pot. Anyways, if you have bolts in your pot, you can also wire it to some pegs in the ground..
Four points of attachment is a minimum. Protection of live tissue is needed if there's nothing distributing the forces of your wire. See the white patches for an example. The green wire has two anchor points on the branch due to the windings of the copper wire.
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See the middle right wire? It's bent because it's loose. That's from moving the pot alone; the tree shifted a little even with 6 other wires keeping it steady. I had to re-tighten that part.
Vermiculite is terrible for junipers. I'd scoop it out ASAP if you can replace it with something else.
I was terribly prepared for the juniper in this picture; wrong season, not enough soil.. I had to correct those mistakes a few days ago
after a year of seeing as much growth as I saw decline. But mine was free to pick up from someones yard and I had roughly two hours to prepare, on a sunday. Either that or the wood chipper. On the scale of things, that bad preparation did cost me a year and a half. I hope that because I do these things wrong and document them, that other people don't make the same mistake.
Good luck with your tree!