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in Fruit & veg
Pruning may be part of the answer but not at this time of the year as you can introduce silver leaf disease. Generally prune plums and cherries when they are in full leaf. It may be that you need the 'right' pollinator nearby (you may need to research that one). Also try feeding with a high potash fertilizer to encourage fruit production.
Training the branches horizontally will also help to encourage fruit spurs along the branches.
Mirabelle is self fertile and does not need a partner, our plums took 3 years before fruiting, it means it could be growing a root system instead of producing fruit.
Festooning is a great technique to use on plums, encourages flowering/fruiting and also controls vigour.
Festooning? Sounds lovely....but what is it?
This diagram shows it quite well: