I purchased my first and as yet only Cephalotus from a forigen gent at Mike Kings spring open day, it was labeld as 'Big Boy' . At the time i was not aware of differnt cultivars, and was the and still am very pleased with it , it has grown very well . My question is having read a recent thread on this site how can I tell if it is Big Boy as there seem to be some forgaries around and looking at pictures of differnt variaties I cant tell the diff apart from some are darker