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It must have been double posted
Didn't we answer this one yesterday?
It's an annual so you'll have to let it seed to keep it.
It will seed
Anything above the graft will be a proper plum tree but it will never have a proper tree shape and it may continue to die back. I'd have it out.
A photo would help
Nettles germinate forever Nick.
I's remove them unless you want a nettle patch.
Or helxine, if it can't spread into small plants close by. I'd go for grass first though
Several stars is very good
I love the binomial system