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Depending on how much you've got, I wouldn't be in a rush to get rid of it. You will find that newly-dug borders and areas around plants sink over winter, and you will need to top up the soil come spring.
I can only agree with Dovefromabove - and I have seen silverleaf move in in response to late pruning.
But you shouldn't prune plum trees now, only in summer, to prevent silver leaf.
I think that the family will have split up in the normal course of things and so scattered.
It could be phosphorus deficiency, which can occur when it is washed out of the soil. It could also be lack of potassium, but you say you've used that to no effect, so I'd tend to phosphorus.
No, you haven't. I find that it always dies back to nothing in winter. I cut it back some years when it has grown particularly rampantly, but usually leave it alone and plant around it, like Christopher.
What is at the base of your raised bed - does it give access to soil?
Yes, but it'll need to be a big container and you will have to water it well.
Do you have a spare windowsill? They can be trimmed down to a few inches and potted up.
Alternatively, you could try a mixture of shrubs, such as mahonia and pyracantha, with woodland flowers such as foxgloves and Welsh poppies.