I am thinking that human-selection of those varieties that are "different" is the way that new cultivars are formed. I'm not a biologist here, but white rats and mice occur "naturally" and often die early in the wild because they are less camouflaged than their siblings. When people started picking out the white ones and breeding them to get more white genes expressed, then the white "lab mouse" type was created. This would be similar, a flower that is expressing some other color is probably natural, but rare, and it would take someone deliberately cross breeding the pollen from one to the other to see if a population could occur.
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