Juliette Sour Cherry (Prunus cerasus 'Juliette')

 Juliette is a cold hardy dwarf sour cherry developed at the University of Saskatchewan as part of the Romance series of cherries.  It's notable for the large size and good flavour. They can grow around 8 feet tall, and are most productive when let grow as a multi-stemmed bush.  They're self fertile.  

Hardiness: Zone 2-3