Small winterflowering Japanese Cherry (Prunus Subhirtella Autumnalis 'rosea').
About 20 years old, but never spent time in the ground. Bought in a garden centre about 15 years ago, when it was nothing more than a felt pen-thick plant.
Needs a glazed or handmate pot later, when it has a bit more ramification.
I need to finish off the repotting with some topsoil. I used a mix of vermiculite-zeolite-cocopeat-lavasand.