I admire your rigorous devotion to the scientific method.
I don't know if your tests, as you've described them, will provide enough significant data to figure out if the phenotype is due to genetics, culture/environment, or some interesting interaction between the two. Out of curiosity: Have you been growing your Cal Reds from saved seed, or commercial?
I was trying to rule out, if we could, the possibility of an intra-genus cross with some other species of allium, but I'm guessing now, that hypothesis may still be on the table?
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