naoki
Well-Known Member
Are you certain David? To me this sounds a bit ridicolous since the F2 of such a cross would vary way more than the F1. But ok, if that is the common practise...It probably explains why there are so many roth Mount Millais around. Back-crossing to get an alba roth-alike is a tempting idea, but in my mind its even worse than crossing malipoense with jackii to get a better malipoense.
Bjorn and Charles, I heard the same thing as David. I didn't check the original source, but see the example of C. Hardyana here:
https://en.wikipedia.org/wiki/Grex_(horticulture)#Horticultural_treatment_of_greges
It seems weird, but if you start to think about any F2 hybrids (or complex hybrids), one plant of a grex could be quite different from another with the same grex.