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I've been growing the same type of Porcelain bulbs for at least 6 years. Maybe 8? I always get around 10% doubles, 30% triples, and 60% quads. I replant each year from the biggest of each clove, and record whether dubs, trips or quads give more, what they give, etc.
I pulled all my garlic a couple weeks ago and just began to sort, weigh and record it. The bulbs this year are 7% quads, 16% quints, 56% hexes, and 21% hepts. No dubs or trips. What the hell??!!