Deffo a one to use guerilla gardening techniques with!
Plant it in a local hedgerow when no-ones looking! To an innocent bystander its leaves resemble a dock leaf.
Just go and dig it up when you need it's root!
btw I haven't got round to trying this yet as mine is in a large pot at allotment ........but when I get around to it, that's what I intend doing.
