RE the yellow zantedeschia, I have grown from seed , the yellow elliotiana , but when in doubt, I do a google and found that there is listed a aethiopica with the epithet of "Mammoth Yellow". I found this on a Martha Stewart website and I think one other location. It could be a misnomer for elliotiana. In any case, if the pbser is looking for a yellow, It's out there. Cherry G