[tedious pedantry] the Aeonium is called 'Zwartkop'. The word is Dutch, the cultivar being raised in a Dutch nursery, not German.[/tedious pedantry] :D
I think you corrected me on that one once as well Paul. In Stan's defence, many more English speakers know German than Dutch and, either way, both sound more appealing than "blackhead"!
I've seen these flowering beautifully planted outside in Cornwall. Coverack rings a bell. Even in my greenhouse I lost my last Aeonium this winter (a Zwartkop!) having once had a nicely developing collection. However Paul, the Mucuna is still going strong!