It’s a “Carmine Jewel “ dwarf cherry bush. Well I know nothing about fruit trees and never sprayed or pruned it. It’s hardy, self pollinating, and a great producer but - not dwarf. The cherries are tart but sweet enough to snack from the tree Very short harvest window , can spoil quickly or get bruised in transportation. That’s why they are so expensive and hard to find.What type of cherry tree is this?