I think I have one! A Greek one. I was on holiday and picked up a cone. They're very smooth and tactile. When I got home I found it in the pocket of my shorts so put it in a large cacti bowl in the front porch for decoration. In the spring I found I had 3 babies, but only one was the thin male and not the bushier female. Ten years later he is still with us and now about 20 feet, growing strongly in the garden in North Norfolk. He is sheltered by a 6 foot hedge to the north and has a 4 pole support as he tends to wave around alarmingly in high winds and when younger tended to need re-heeling in when the ground got a bit soggy. He seems to object more to wet than cold (goes a bit yellow) - we do get quite chilly here, especially at the moment!