I just tasted my first batch of Korean Bush Cherries today. They are obviously earlier than most pie cherries. They have small but pretty pink flowers that are blooming as I recall about the same time or a bit earlier than other cherries. The bloom period seemed remarkably short, but it will probably extend as their years go on. I believe the species is called Prunus Japonicus. They taste good, but the cherry is smaller than either most pie or sweet cherries. I would call the flavor more similar to sweet cherries than to pie cherries. They don't have that power packed full strong cherry flavor that a pie cherry does. I will probably try to plant a cutting in the fall and maybe graft Montmorency onto it. I previously grafted Montmorency onto a type of Chinese bush cherry that won't fruit here and it took. I got it from One Green World. I did find that I need to prune it rather heavily to prevent some of the typical cherry diseases that they can get around here. I am stoked. So many other similar plants won't fruit around here.
John S
PDX OR