Beyond this I can't help you.. maybe if you can change the thread title or start another thread "my plum tree has thorns" someone on here might see it who knows how to help you.
If you do end up with a blackthorn it's worth thinking about keeping it in a quiet corner of the garden. They look great in April when they blossom, about a month before the hawthorn.
Well, this one never gave a flower or fruit in the 3 or 4 years that have been growing. But it has an amazing collection of thorns!!!! Thank you for the link, I get sick thinking about throwing it out, if it is not something nasty, I can plant it in a corner of the garden.
Now that I look more carefully at the picture, I can see the two different sections. Prune out the thorny one right down to where it meets the other, but be careful not to damage the graft area. It'll be easier to see what you're dealing with (and better for the tree) if you pull out the grass from around the base first. Now that you're aware of its capabillity to throw up shoots from the rootstock, you can keep an eye on it and get rid as soon as they appear.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
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In the sticks near Peterborough
Thank you for the link, I get sick thinking about throwing it out, if it is not something nasty, I can plant it in a corner of the garden.