I would add that a 'x self' should produce a plant that is 'closer' to the self, genotype and phenotype - in theory. A 'x sibling' would introduce, in theory, a range of outcomes especially if the sibling had a different phenotype and thus by implication a different genotype. For example, I have seen with my first blooms different shape and markings and even different foliage colours. If the sibling parents are made up of a number of species, then its logical to assume that the offspring will display these origins in varying degrees.
I have seen proof of this in my amaryllis seedlings too. I have about 50 seedlings, of which 5 have bloomed and I expect at least 10-15 more seedlings to bloom this Summer. I selfed the parent as I had read that Amaryllis do not breed 'true' - in other words the progeny do not look like the parent because the parent is itself a hybrid. Well out of the 5 to bloom so far, 3 are as close as darnit to the parent, whereas 2 are noticeably different. I could do further experiments ( backcross to parent, self, x sib etc ).......but I don't have the space !
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