I must say that you are blessed to have this oppurtinity. You can take almost all the time you want to examine and select your future purchase. Out of decidious tree, maple are my favorite kind.
Now , dont have the answer to your post, on how to transfer your tree from greenhouse to exterior. As far as I know, maple need temps around 40 degree F, in order to get in dormancy. If it was my tree, I would check the temperature at the green house this winter. When temperature in the exterior get the same, bring the tree outside, protected from the wind, gradually exposing the tree to exterior condition. The tree will wake up outside, in the shade, and will have no problem surviving. This would be my procedure. May I be corrected by a more experience member, thats possible.
Dont excuse yourself about a long post. I can feel the joy in your post
