Followed you on Instagram by the way!I'm zone 4 NE Ohio. All my deciduous go into Aoki a Japanese blend except my ginkgo and trident clump. It's what Scott Lee uses...and he was my original go-to guy before he stopped handling a lot of deciduous. Which is why Jason is my now go-to guy.
There is a break down of what it is. For ones to make their own. I happen to not know it. As I prefer buying pre-made.
I don't use pond baskets. I just don't like the look of them. I have good luck with trees in Aoki. I'll say this... this Catlin Elm came from Jason. It's in a small pot. I only needed to build the canopy. The tree's bones there. Was in a small pot since with me.
This is what three years was for me. Jason uses Boon mix. Which is simular to Aoki but doesn't hold as much moisture. Because I use Clay King which is what Boon mix is to compare to. For my JBP and my ginkgo.
Don't get me wrong. I have trees up potted. In training pots or ceramic pots that are bigger than a finished pot. But my first elm...came in a tiny pots and developed great in it. Again I wasn't growing out the trunk. But the structure for the canopy.
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So basically look for either aoki or boon mix for the pre bonsai and you think I'd be fine with either nursery pots or pond baskets for growing it out a bit ?.
Do you buy the aoki anywhere specific ? Don't you bother with pine bark in either mix to retain some moisture ?
Also for fertilizer regarding the pre bonsai stock you're growing out whats your regimen / brand usage like if I may ask ?
Thanks for being so responsive and helpful you're a gem !