tony wrote:David where did you get that information from? Having done a lot of googling since I read your post it would appear the consensus is that very well drained poor soil in full sun are the preferred conditions.
Out of my memory, I'm afraid. I recall reading (and discussing) how difficult it was to establish this sp. in Britain, that it resents transplanting and that its native range generally has acid soil. It grows freely in the Gulf Islands off Vancouver, which get a hell of a lot of rain in winter. In fact much of the coastal northwest region where it originates is basically temperate rain forest.
I agree about the full sun and I'm not sure about the drainage, although the hundreds that I saw growing on Pender Island BC were growing in very rocky, infertile soil.
So the two versions aren't really inconsistent: sunny sites in a rainy, cool climate with poor, acid soil and good drainage.
I suspect that the main reason people have found it so difficult is because it doesn't like being moved.
EDIT: I just checked Wikipedia, which backs up the lime-free soil, the dislike of transplanting and the need for full sun and says that growth can be boosted with N-based fertilisers, but that this makes the tree susceptible to disease.