Posted: 20/09/2013 at 17:24
I have a couple called 'Lisa' and I just leave them as they don't seem to be a very fast growing variety. I had one in the garden originally that was big and half of it died due to it being top heavy and it split. The remaining half is very spindly but still looks nice.
I suppose you could just prune the lower branches, to raise the crown so you still have the leaf growth.