Posted: 27/11/2013 at 21:31
I think you're right - put it into a decent pot with some John Innes Loam based compost, JI No 2 or 3 would be fine, with some added horticultural grit. Put some crocks (pieces of broken terracotta pot or tile) in the bottom to aid the drainage.
Keep him outside as much as possible - he's a forest tree from Northern Europe and won't relish the dry conditions of living indoors. When he is indoors it might be a good idea to mist his leaves every day.
Planted outside in ideal conditions he could reach between 20 -40 metres tall, but he won't do that while he lives in a pot.
Enjoy and send us of photo of him in his new pot with his tinsel on