If they don't agree, just spray any that comes thru to your garden. Make sure you protect neigbouring plants you want to keep safe.
If you can take a close-up photo of a stem of that shrub and any flowers, we can identify it and tell you how to prune it if you want to reduce the size. It looks very healthy.
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
I wouldn't spray, I would use the gel form. Most of the leaves are probably coming from one large plant, so if you gel the leaves on your side, the chances are that it will kill the whole thing. It takes a month or so to work, often, but be patient and treat it yearly.
And use the trick of winding the stems up a cane or two. You can then put a bag over it or more easily control where you are spraying if you spray . As Fire said you can get a wipe on version. Good control but a bit labour intensive if there is a lot. @Fire. Do you have to do all the leaves? Or just some is enough to kill the whole lot back?
If the odds suggest the leaves are all on one plant, then you could do ten leaves and it should kill the whole thing. It's all connected. I do the back of the leaf, not the front for better absorption. Works for me. I have bindweed coming in from next door every year, though, as I kill it off before it flowers, there is less and less each year. We just have to make sure not to break off any part of the plant as it may create new plants.
Heck of a thing to get rid of: I had some behind my garage, which is more of a utility area, dug out what I could and put black polythene over it for three years, even after that time some popped up which glyphosate dealt with. I pulled the stems and leaves into a bunch, put glyphosate in a poly bag and crammed the stems and leaves into the bag, sealing the bottom. It gave the leaves a soak in the weedkiller and kept the weedkiller off other plants
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If you can take a close-up photo of a stem of that shrub and any flowers, we can identify it and tell you how to prune it if you want to reduce the size. It looks very healthy.
As Fire said you can get a wipe on version. Good control but a bit labour intensive if there is a lot.
@Fire.
Do you have to do all the leaves?
Or just some is enough to kill the whole lot back?