Gene,
You have it potted, but in the ground, ie another pot, ie a socket?
Ie, the pot in pot method? I've been looking into this, and if this is what you've got, it seems like the tree is really doing well.
http://www.nurserysupplies.com/gs/pnp/pnp.php
is what I've been looking at. Seems ideal for me - can pot em out during warm months, yet still pull em in for the winter. Just kind of expensive for the upfront costs. (that particular system)
Ahhhh, I think you just have a plastic border around it, now that I take another look at the pictures. Anyone here do the pot in pot system? (/me hijacks thread, but in a good way)