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Weigela

I have a very large weigela which is over 30 years old. It gives a mass of beautiful pale pink fowers every year which the bees love. It is about 4m high but my neighbour has been reaching over and taking chunks out of the height of it at any opportunity so it is losing the lovely bushy shape it had. This year it's had a lot of dead branches which I have cut out, but it also has a lot of new growth springing out from other old and thick branches;it also has some newer thinner shoots growing from the base. I have also noticed that many of the varigated leaves are turning pink/red I have tried feeding it with some kelp feed and hopefully that will help it and it could probably do with a good hard prune but I am terrified of losing it completely as my Dad planted it a few months before he died. Could these problems be caused by the random cutting by my neighbour or does anyone have any idea what else could be causing them when it's always been fine before? Many thanks for your help.
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It's perfectly normal for older foliage to change colour and drop off too, and on a mature shrub, that happens more often.
Regarding your neighbour, it wouldn't harm your shrub, but he/she has no right to lean over and remove anything. They can remove anything overhanging the boundary, but not branches that are clearly on your property.
If you have a photo, that will help with further advice though
I live in west central Scotland - not where that photo is...
I actually reported my neighbour to the police for trespass and criminal damage as it got to the stage where everytime I went out they would cut off more, but it isn't the crime of the century so it wasn't taken seriously. They still do it, so I've started leaving a trail camera pointing at the shrub now when I go out to try to catch them in the act.
I'll go and get those photos.
My weigela is still hanging in there and is flowering again but sadly it is just a shadow of its former self with more dead branches. It is upsetting to see because before my neighbours started hacking it, it was beautiful I have added some bone fish and blood to the soil around it in the hope this will help but is there anything else I can add to the soil?
I need to cut out the dead branches, some of which are quite thick, but is it OK to do it at this time of year and just make horizontal cuts across them? Also, should I treat where I have cut with anything to stop disease? (I think linseed oil use to be recommended but I don't know if that is OK for weigela).
This was taken today
https://www.rhs.org.uk/propagation/semi-ripe-cuttings
I have heard that you can just put pieces into water and roots will form, but l haven't tried that myself
I would definitely try to take some cuttings to perpetuate your Dad's shrub. Weigela are fairly tough so a selective, 1/3 per year, hard prune should rejuvenate it. It will look very bedraggled for the first 3 years but could save its life. It would give you the chance to train the shape of the bush not to overhang your neighbour's garden and reduce the height substantially.
I must admit, I do feel a bit sorry for your neighbours. The bush must cast a lot of dense shade into their garden and a lot of debris from fallen leaves in the autumn so not surprising they have resorted to cutting it back on their side. I agree they have no right to reach over the fence to your side. Also, according to law, they should return anything they remove, to you, unless you agree to them disposing of the branches etc.