This was my initial choice. In between the red beeches, in a nice warm sunny spot. The problem with this location however is twofold. First it would be terribly difficult to dig the planting hole. The roots from the beeches have made it almost impossible to plant a simple rose let alone a small tree. Besides I don't really want to damage the beeches since they are such a feature in the garden. Secondly it is quite a small space. While the Albizia might be ok for a season or two, it would quickly outgrow this narrow spot. Which is why I went with an alternative location.
This location is slightly less sunny but has a lot of .other advantages. First of all the tree has room to grow here and you can actually see it from the house. The dark taxus foliage provides a similar contrast as the beech in regards of the pink flowers. So it is decided, let's get on with the planting.
I know that you are theoretically supposed to dig a hole twice as deep and twice as broad as the rootball but who has time or space for that? It is deep enough to put in an inch or so of good potting soil to give the tree a bit of a head start and plenty of room at the sides as well. So after firming it in and giving it a good drink the tree is looking good, even if it could stand to grow a bit and peek above the hedge completely. It should have enough time to get established before winter. I hope this is one of the more hardy varieties (Rosea?) even so I might just take a couple of precautions during the coldest nights (probably some fleece and a good thick leaf mulch to keep the roots cozy)