Will conifers ruin my new rose bed?

My next door neighbor has filled his garden with leylandii trees, which are at least 8ft in height. We both have medium size gardens. He has made a sort of maze out of them, so he has loads in a very confined space just the other side of my fence. Issue is, is that the only place I can put in a rose bed is against my side of the fence, meaning the roses will be less than 10ft away from all of his leylandii tress; as this spot gets the most sun. The soil type is heavy clay, but the garden already feels hard underfoot despite the unusually wet spring we have had... so usually, I would need to apply a really good drainage system, but considering his roots have probably sucked all the gardens dry for at least another 2 houses down, should I even bother digging it? PLEASE HELP
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Will your rose bed still be in the sun when his trees grow, bearing in mind they can reach 80ft.
You are fully entitled to chop off any roots your side.
Maybe building a raised bed for your roses would help or choosing varieties which cope with less sun might mean you can site them somewhere else.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
No, they are long established trees. Ive not lived in the house long. The site gets very good sun
Good luck 😊
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
In any case, apart from offering my sympathy, I'd go with the physical barrier method, and a low, raised bed if you can get the materials etc just now. Plenty of well rotted manure will also help with moisture retention for the roses too.
If it's the only place you can site them, perhaps a simple irrigation system too, to make watering easier, especially when you're getting your plants established. A mulch too, again - if you're able to get something
I live in west central Scotland - not where that photo is...