Neighbour keeps cutting climber on our trellis

[Nineveh]

We have a wisteria in our garden and when we moved in last year our neighbours told us it had previously got out of control and the weight of it had made the fence collapse leading to a new fence (which the previous owners contributed to because it was their plant.)
Our neighbour made it clear she didn't like the wisteria and wanted it removed entirely but the previous owners had refused.
We've been here a year and we have pruned it really hard and put up a trellis to support it. But our neighbour keeps cutting it when we go out! We're just back from a week's holiday and she has not just cut the bits at the top of the trellis but has clearly either been in our garden or got a ladder and leaned over to cut it right back on our side too.
Is she allowed to cut plants on our trellis where they weave in and out so are visible to her?
I don't want a big confrontation but clearly need to resolve so any advice would be much appreciated! Thanks

Whether she is 'allowed', and I doubt she can cut it from your side, I would be blummin livid and would tell her so.

I'm not sure where you actually stand if she keeps on doing this and if she was so brazen to carry on if you could actually stop her.

I think a few words need to be had, it doesn't have to be a big confrontation but people usually get away with this kind of shit as people are too afraid of not being polite

Is it her fence? You refer to “our trellis” but it sounds as if its her fence and previous owners contributed because it was their plant.

I may be entirely wrong, but my understanding is that if the boundary structure (hedge/fence/wall) is yours, any plant material extending into neighbouring property can be trimmed back. They certainly have no right to lean into your property and cut plants back. On the other hand, if its their fence, you need to seek permission before attaching anything to it, even on your side

Yes, as Trethew says, they can cut back things overhanging into their garden, but they certainly can’t cut anything on your side of the fence. I think you also need to establish who owns the fence.

Can't blame her when she's already had to fork out for a new fence because of someone else's plant.

Maybe if you agree to pay for any damage the plant does in future she would be happier.

Have you attached a trellis to her fence?

If it's a wisteria sinensis they grow very big and woody with thick trunks eventually. They need a very sturdy structure or a wall in the longer term.
I think you need to do your research and consider whether you want to keep it and make a plan for supporting it separately from her fence. This can be done. Also, are you aware of the pruning regime needed to get the best out of it flower wise?

It sounds like the neighbour's fence so I can only echo a PP who asked if you've attached your trellis to her fence!

Can you keep it trimmed below the top of the fence? She shouldn't clip the plant on your side but yes, she's entitled to cut back any overhanging plants on her side so could probably clip all the bits on her side of the trellis which would be a pain (to you) anyway.

Could you take a photo? It’s unclear how the fence situation works. Is it wood?

Wisteria can bugger up brickwork. Dh won’t let me have one. So I can imagine they will really damage a wooden fence.