Posted: 17/10/2016 at 13:59
Having recently dug a 20 year old one (which I grew from seed) out of a raised bed, I will echo the posts above. The roots are huge and thick but easily snap (they are really water storage organs) so pulling them up is not possible, they have to be dug out. They look great in a very large garden where they can stay for half a century or more and won't poke anyone's eyes out. If you have a relatively small garden which you might want to completely revamp within your lifetime, don't plant one!