I have a happy and producing sabara jaboticaba in a 75 gallon fabric pot that will do better with an up pot and getting rid of the fabric pot. The soil dries out super fast, the edges are always dry, and it leaches a lot of water into the soil below it. It probably has oak roots coming into the bottom too... Anyways, NEVER use a fabric pot is my lesson to all of you.
There are a few options I'm considering for an up-pot:
65 gallon blow molded pot (these are $150 delivered) and dimensionally should barely work, the opening is the same width as my current pot, I may need to prune off / narrow the bottom roots to fit in fully but basically it's the exact same size. Not ideal because the tree won't really get to grow any more root mass, but it will work.
100 or even 300 gallon stock tank and drill a bunch of holes in it. The 100 gal stock tank is the same width as my pot up top but appear to be really narrow in the bottom and I'll probably need to cut off a bunch of roots to fit it into the taper, but then the plant will have some room (10 inches on either side) of fresh soil to get established in. If I get the 300 gallon tank, it will be a ton of $ for soil, the pot, and all that, but the tree will then have years of soil to grow into and will be happy probably for as long as I own it. The 100 gallon is $150, the 300 gallon is $300.
Putting it in the ground is not available to me due to being a renter, extremely high alkaline soil, and gopher pressure.
Any suggestions?