Posted: 06/08/2014 at 19:14
Yes, not to be rude, but yes, the answer is, I'm sure, just pollination. If you don't have flowers then you won't get fruit, if you get fruitlets but they all drops off then it's stress of some kind. If you don't get any fruitlets forming and you've had flowers then it has to be pollination. Don't forget your cherry plum will flower very early in the year when there is very few pollinating insects about. I had cherries on my Prunus incisa for the first time this year in over four years of beautiful shows of flowers, why?, I cross pollinated it myself with a feather duster, not to pollinate the P. Incisa but to get pollen from it for other early cherries. Prunus Incisa if you don't know it is flowering beautifully by the second week in March up here in Durham while most other things are still fast asleep. Anyway, the point is no bees, no cherries unless you do the job yourself. Yes, a pollinator will help but if you don't have bees no matter how many pollinators you've got you'll need to do the job yourself. We have lots of Cherry Plums in the hedgerows up hear and get a few plums each year but I'm sure we'd get orders of magnitude more if there were more bees about. And no, apples won't help in the least, they're not nearly closely related enough.