Sorbus domestica. This is a grafted true service tree of a very special variety called "Christophs Apfel". The reason this variety is very special, is because it flowers and fruits at a really young age. A friend of mine grafted this tree last winter and it flowered and made fruit. To graft a tree and then have it flower and set fruit straight away is very unusual. This variety is known to flower and fruit very quickly at a young age. To me this is exciting because i planted about 20 sorbus domestica trees on my land, the oldest one was moved from our old property, and having lived here for 5 years, i am still waiting for my trees to flower. Since this young tree flowered last year it should flower again this year, all going well. I will post pictures if it happens.