I have only seen the single trunk kind in our area, it is one of my favourite trees. I planted one a few years ago, and it has behaved very well, although it wants to lean a little, so I have tried to straighten it while it is still young; it is easy to see that the prevailing winds are coming from the north-east. When we arrived around Easter this year, some of the leaves had already started come, but it was still a joy to see it in bloom.