Posted: 16/04/2013 at 13:17
I have two specimens growing in my garden, both about 12ft high but they are at least 25 years old. I have acid soil which they like and it is also reasonably moist. I think moisture might be the key thing for your potted specimen - don't let it dry out.
Bees love the flowers which are jewel like - solid, firm almost artificial looking flowers which the bees wriggle into for the nectar.