Self-fertile, a great choice for a location with good soil/drainage if you're looking for only one tree.
Sambucus nigra x S. canadenis. A cross between the native American elderberry and the highly-nutritious European elderberries. These trees are a fantastic addition to the pantry - from making elderberry flower syrup to making jam and syrup from the berries. The berries are highly nutritious, with high antioxidant content. And to round it off, elderberries also make beautiful garden specimens, with their huge, creamy white flowers, lacy leaves, and large bunches of dark berries.
