So far it looks like they should all fit into a Large Flat Rate box.
Another one that get very large at maturity is 'Persephone'. It has proven to be a tough plant in my raised beds, in all our seasons.
Hen and Chicks (Sempervivum 'Persephone')
Another that goes through many different color changes throughout the year, strong grower.
'Honigmond'
Hen and Chicks (Sempervivum 'Honigmond')
And you should really try the roller types. They are very tough and productive in making increase.
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