Why is this tree not available to buy in the US? I cannot find it anywhere, except in the dwarf, or variegated, or yellow needle varieties. I am looking for the variety that is tall, 40' or more, with green needles and it tends to branch low on the trunk with many upright branches. I have seen at least two of these trees in Portland, one at a residence and the other at the Japanese Gardens, so I can tell that it can grow to mature size here. This kind of tree is so beautiful it seems odd that no one is selling them. Is there a problem with them? are they easily diseased? Thank you very much for considering my question.