Hi Dave, I didn't get a chance to reply...to me the most important factor with these plants is making sure they have enough humidity and light (guess that's 2 things!) even more than the pot size issues, I found that they cared more about my keeping moisture - I used pebbles on a tray and kept that with water all the time, then place the pots on top of this...even if you're using the oyama pots, I don't think you can have too much humidity for these guys! I had mine in a west facing window and they loved it! There is some shade in summer because there are trees outside, but I'm on the 3rd floor so its pretty bright! I have 2 pots left (after giving away about 5 other plants and loosing a couple) I just moved them outside, which they seem to love!! I use any fertizer that I have, and I use it at every watering, but at 1/3 the normal strength, it seems to keep the plants strong!! Mine bloomed for almost a full year straight!! (currently I just haven't been keeping good care of them, I haven't been watering regularly and not using fertilizer...I'm going to begin that again, and I bet I'll get blooms within a month or so...I love these guys for how forgiving they seem - much more so than AVs in my opinion)
I used regular potting soil and added some pumice to the mix, which is pretty much all the AV mix of soil is!
Hope that answers your questions. I'm no expert, it is just what worked for me...I wanted to fuss as little as possible, and they did pretty well - I think I got lucky with my windowsills though!
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Keep us posted about what you do and how your plants do!! By the way, I transplanted my plants as soon as they arrived, into 3.5 inch clay pots and they loved it! But I like the leave growth, which is what I think happens when they are in too large a pot!