To Chuck weedkiller over fence ?

It's probably sorted after 4 years.

You certainly can cut it back up to your property line.
You do not need to inform them that you are cutting it. It's your right to do so.
You must ensure you throw back over any trimmings, leaves, branches, etc. and do not keep or throw them away , as this can be classed as theft, unless you have been given permission to do so by your neighbour. However even then I would throw the cuts offs back over, especially if it's a neighbour that likes to cause trouble.

Throwing weed killer over the property boundary line. I wouldn't do that. Not here in the UK anyway. Once you go past in to or on to the neighbours property's boundary, without consent that's when you're breaking the law.
If something is growning thru / in to / on to your property line, you have a right to remove it.

Just have some kids round to play in your garden and be careless with their balls and frisbees. That's how my neighbours wrecked my wildflower border and knocked down all the sunflowers.

I really sympathise with you, however, there are a few reasons why you should not just chuck weedkiller over the fence. I took over a garden in a similar state to your neighbours, and learnt that for one, unless you have a special formula, basic glyphosate is actually unlikely to work against brambles. Even if you use a glyphosate based weedkiller specially formulated for brambles they keep coming back for years, you will be at it for ever, not to mention the cancerous and toxic nature of glyphosate based weedkillers. The idea of a boundary at ground levels, something like the root cages used for bamboo, and chucking the cuttings back over to make a layer on the top is a good idea, and it really works. A bit of salt and vinegar works really well too, but beware that it does affect land around, in other words, could affect your plants too. A horrible situation to be in. Would she be liable for damage to your fence? Have you thought of contacting a solicitor?

I get it, OP. We paid that sort of money for our fences too; that's how much fences cost where we live.

We have aggressive brambles encroaching from two separate properties. They are taking over our garden. We haven't put down weed killer (and I never would due to the harm it causes) but I can understand that you are feeling desperate. I am interested in non-toxic solutions and am following the helpful part of this thread.

Until you've lived in the middle of a bramble patch I think it must be hard to understand how difficult it is. It's not possible to just cut back; that would be a full time job and I for one don't have that sort of spare time (or wish to spend it on pruning).

*sue

Maybe your neighbour likes her garden like that? Mine is a bit overgrown. As a result, I have hedgehogs and slow worms and loads of moths. Why ever would you consider throwing weed killer on someone else's garden? I'd due anyone who did that to mine.

Not okay OP. You can't police what people have in their gardens. I agree with @pollypocketlover 100%

Of course you cannot chuck weed killer over a fence. Mind you, I have never found one that works. I have just about come to the conclusion that they are all placebo, either that or my weeds are indestructible.

You're starting to sound unhinged now, to be frank. Don't ask if you're being unreasonable if you're not able to handle people telling you you're wrong. And if you find yourself agreeing that it's OK for someone to give children chemical burns over the sake of an ivy bush, perhaps it's time to consider seeking some professional help.

And yes, we did disclose, unlike you I'm not entitled and I don't think I'm above the law. Have a good one!

I'd be happy for my neighbour to come and douse my garden, being as it's all gravel and block paving.
It would save me the job of having to get rid of everyone else's weeds!

YABVU. Of course you can't decide to unilaterally spray your neighbour's garden with weedkiller, what an absolutely ridiculous idea.

The crazy ivy killer lady was from a few years ago and we've since moved and I was wondering if I was being paranoid about still insisting on 24/7 surveillance in our garden. Thank you to the people on this thread for proving to me that surveillance is very much a nessecity, evidently you never know if you have a CF neighbour waiting for you to go to sleep so they can douse your garden with poison!

It was our wall, and our ivy was perfectly contained, thank you.

We had our crazy ndn think she was entitled to kill our beautiful ivy

If your 'beautiful ivy' was spreading to your neighbour's garden and weighing down the dividing fences, she was right to poison it. You sound very entitled.

Next to walls or on top of your neighbours fence?

If the neighbour has paid for the fence then planting ivy that will weigh it down is not your right.

I love ivy and have all the 8ft walls surrounding our home covered in it over the past 70 -80 years. It weighs a tonne, but the boundaries are mine.

Ah, you're one of those.

We had our crazy ndn think she was entitled to kill our beautiful ivy. She sprayed poison on it without telling us and we found out after one of the kids had a horrible skin reaction - they liked to look in the ivy for bugs.

We lodged a formal complaint with the police, who came and told the ndn that she had zero right to poision our ivy, and we set up a 24/7 camera in our garden, which the ndn took extreme offence to. Again the police informed her that we were completely within our right to film our property. Our wonderful other ndn, who witnessed the CF pouring the weedkiller on to our ivy, said they were happy to testify in small claims court on our behalf too.

It is completely legal for people to grow plants next to walls, and some of us don't want sterile little gardens. You are in the wrong and an absolute CF for planning to do this.