Northstar is a sour Morello type cherry that's very tasty right off the tree. Fruits are large and the stone small and easily removed. Tree is a genetic dwarf, grows less than 10' tall. Self fertile, excellent for home gardens. Zones 5-8.
Montmorency pie cherry is the most widely known sour cherry planted throughout North America. The fruit is bright red with a clear juicy flesh. Trees are self fertile, winter hardy and very productive. Space 10-12 feet, height 10 feet.