Making a rose obelisk using copper pipe
Can anyone advise me whether it's 'harmful' to roses to grow them on an obelisk made from copper tubing?
I found a beautiful, simple 'tripod' design with a spiral extending from the base to the apex. The three legs are made from 18mm (ÃÂ¾ inch) copper pipe and the spiral is made from 1mm copper tubing.
I mentioned my plans to a friend who assured me that copper is toxic to roses because it oxidises when exposed to the elements and this has a toxic effect on the roses.
Is this true? I've seen copper structures for roses advertised online so I imagine that they wouldn't sell many if they're harmful to roses Ã¢ÂÂ¦ but I really have no idea.
I would be very grateful if someone could give me some advice.