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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:
I have a similar problem with a new Victoria, bit of blossom first year of planting but nothing last year or this, though it's growing well and seems healthy. I mulched with compost in Autumn, should I mulch again with some potash compost now or leave it till Autumn?
Like the festooning idea so will give that a go this weekend if I can work out how to anchor it!
Tie the branches to bricks??
Always ensure you don't burry the graft if you do the scion will root and want to be a large tree before it flowers.
Leaves again this year, no blossom as yet but the plum tree right next door has had lovely blossom. Maybe this will be the year for the Mirabelle
My Mirabelles have finished flowering already, I'm in County Durham. This is just the first full year they've been in. I think you've buried your graft. Have a look at the base of the tree if you can't see a join then dig down gently with a trowel until you find the join.
If you have buried it then uncover it, if any roots are coming from the scion then remove them with a very sharp knife or secateurs. The graft/join should be well above the soil since even an inch above may not be enough to stop the scion rooting in especially since you've mulched. I've got an apple tree that I think has probably rooted from the scion even though it's above the soil. There's roots coming from the join which could be from either the rootstock or the scion and it still hasn't flowered which tells me I need to get the secateurs out.
Many thanks for this helpful image. I shall have a look and what's what with my Mirabelle. If necessary then the secateurs it will be
I cleared the roots from around the graft on my apple yesterday. I'm not sure if they were from the scion or the rootstock looking at this photo they look like they came from the rootstock but I'm glad I cut them away, it won't hurt the tree in the long run. Hopefully next year it will flower. There's flowers the Court Pendu Plat I grafted onto it but I'm not going to read much into that yet. The variety was originally Ambassy. I don't know much about that other than it's an early and that's probably it only virtue.