Re: Tregran plant sale - advice for the auctino please.
I don't think anyone would laugh and point if you offered any of those three, Chad, as they are all treasure. If you are talking about 'rare' then possibly of the three I would say the crambe as I have only seen it in habitat in the Canaries, never seen it offered in the UK. But then again it is arguably the least spectacular. So, on that basis, the bocconia would win.
Of course you could always donate all three....