I'm afraid it will be detrimental to any plant, unless there's some kind of lining within that prevents contact with the copper outside. Any lining you add to it would need to be bot impermeable and firmly welded to the copper on the outside, or there's a high risk that the copper will perfuse through the water within the compost.

I feared that would be the case, thanks for your help

Could you put a big pot in Bamboo?......I,m thinking of hole free hostas.....the slugs wouldn't climb up there. :0)